If you played Lobotomy Corporation, Battle Symbols are pretty much just Gifts: cosmetic items that boost your stats by a small amount.

Unlike Lobotomy Corporation though, instead of getting them randomly, you have to fulfill certain conditions in battle to unlock them.

Each floor has to reach a certain level before your librarians can equip Battle Symbols. Once you reach the required level, you can equip Battle Symbols from the tab next to the Combat Bookshelf.

It seems that unlocking Battle Symbols also unlocks its respective titles for use in librarian customization.

NOTE: It seems that some of the Battle Symbols are a bit buggy, with some being unobtainable despite fulfilling the conditions (notably Emma and Noah's symbols) and some being obtained despite not meeting the requirements. If you encounter any buggy symbols, you can submit a bug report and hope PM fixes them later on.

Special Thanks:
https://psteamcommunity.yuanyoumao.com/app/1256670/discussions/1/4203492762830366782/ (Launch Symbols)
https://www.reddit.com/r/libraryofruina/comments/hopae9/pinochio_you_liar_about_pinochio_and_question/ (1.0.1.1 Symbols)
https://psteamcommunity.yuanyoumao.com/app/1256670/discussions/1/3091137796291955622/ (1.1.0.3 Symbols)
Everyone on Discord who sent me pics of the 1.1.0.3 symbols!
As well as everyone who commented about their new finds!

Acquire: During the first episode of Streetlight Office encounter, defeat San, Lulu and Mars all with a single character.
Effect: Stagger Resist +1

Acquire: Defeat Walter 1 times with Book of Isodora equipped.
Effect: 5% chance to boost Slash stagger damage by +1

Acquire: Defeat Olga 1 times with the Book of Mika or Rain equipped.
Effect: 5% chance to boost Pierce stagger damage by +1

Acquire: Survive through a complete Wedge Office reception.
Effect: HP +1

Acquire: Complete an Urban Plague-level reception after activating the 'Unrelenting' passive of Oscar's Page with no other allies present.
Effect: HP +2

Tip: The most consistent (though time-consuming) way to do this is to fight the Kurokumo Clan til the second floor and kill everyone except Gin (he applies at most 2 stacks of bleed) and make sure he is low enough to be finished off with a strong card like Transpierce. Let him kill everyone in the first floor and have only the librarian with Oscar's page fight for the second floor. Let him activate the passive and finish him off.
There is a chance that you may get unlucky and have the passive activate when you're at 2 or 1 HP and you'll die of bleed next turn. If that happens, you can still kill Gin and the battle counts it as a win, however, you won't get the Battle Symbol.
Special thanks to those in the comments who recommended this strat!

Acquire: Win 10 clashes against Ranged Combat pages.
Effect: 4% chance to boost Slash dice Power by +2 while HP is at 25% or lower

Acquire: During a single Act of an Urban Nightmare-level reception, defeat 3 enemies while the character's HP is at 25% or lower.
Effect: 4% chance to boost Pierce dice Power by +2 while HP is at 25% or lower

Acquire: During a single Act of an Urban Plague-level reception, inflict 20 or more Bleed to a single target.
Effect: 5% chance to boost Slash Stagger damage by +1 when attacking a target with 10+ Bleed

Acquire: Defeat Emma and Noah while they're together.
Effect: 10% chance to boost attack damage by +1 while Noah's Page is attributed to this librarian

Acquire: During a single act of an Urban Nightmare-level reception, use Combat Pages that include dice boosted by the passive ability 'Grace of the Prescript' 3 times.
Effect: 5% chance to boost attack damage by +1 while Singleton.

Acquire: Change damage resistances 5 times with the passive ability "Information Assessment" of Dante's Key Page.
Effect: 5% chance to boost Stagger damage by +1 when attacking with a type the target is "Weak" or "Fatal" to

Acquire: Use the Scarecrow Searching for Wisdom's Abnormality or E.G.O page 10 times.
Effect: While possessing Scarecrow Searching for Wisdom's Abnormality page, 5% chance to boost Stagger damage by +1.

Acquire: In Star of the City-level receptions, discard Combat pages 10 times through the effects of Thumb pages.
Effect: 4% chance to boost Defensive dice Power by +1 if the character discarded a page last Scene

Acquire: Defeat Kalo with Boris' Key Page equipped.
Effect: 5% chance to boost Stagger damage by +2 in a clash against an opponent with more HP

Acquire: Defeat 1 enemy using the Combat page "Castigation" in Star of the City-level receptions.
Effect: 4% chance to boost Pierce dice Power by +1 when in the "Blade Unlocked" state

Acquire: Defeat 1 enemy using the Combat page "Decapitation" in Star of the City-level receptions.
Effect: 4% chance to boost Defensive dice Power by +1 when in the "Blade Unlocked" state

Acquire: Defeat enemies with the last die of the Combat page "Feral Knives" 1 time.
Effect: 4% chance to boost Offensive dice Power by +1 when the character has a Speed die with Speed of 5 or higher

Acquire: Defeat 2 enemies using the Combat page "Disposal" in Star of the City-level receptions.
Effect: 5% chance to boost dice Power by +1 while the character has 20+ Charge

Acquire: Defeat Kalo, Nikolai, and Iori.
Effect: Starting with the 11th Scene of an Act, 7% chance to boost dice Power by +1

Acquire: Defeat E.G.O-manifested Xiao with Miris' Key Page equipped.
Effect: 4% chance to boost Blunt dice Power by +1 when attacking a target with 20+ Burn

Acquire: During a single Act of a Star of the City-level reception, activate the passive ability "Policy Form" of Irina's Key Page 4 times.
Effect: 5% chance to boost Stagger damage by +2 if the character discarded a page last Scene

Note: This one doesn't seem to have a visual

Acquire: During a single Act of a Impuritas Civitatis-level reception, activate the passive ability "Hana for All" of Mirinae's Key Page 4 times.
Effect: 5% chance to boost attack damage and Stagger damage by +1 if the character has Strength, Endurance, Protection, or Stagger Protection gained from Combat pages

Acquire: Take 3 hits with Book of Finn equipped.
Effect: HP +1, Stagger Resist -1

Acquire: Discarded 10 pages using Molar office pages.
Effect: 2% chance to boost Pierce dice Power by +1

Tip: I used Olga's Page with 3x Daring Decision, 3x Art of Rapid Steps and 3x Wait Up! to do this pretty quickly. In addition to being a pretty powerful deck, I was able to get this symbol in 2-3 battles.

Acquire: During a single Act of an Urban Nightmare-level reception, lose HP through Combat page effects 5 times.
Effect: 4% chance to boost Blunt dice Power by +2 while HP is at 25% or lower

Acquire: During a single Act of an Urban Nightmare-level reception, draw 1 page with the Combat Page 'Leap'.
Effect: 5% chance to boost attack damage by +1 on Scenes where Charge was spent.

Acquire: Complete a Star of the City-level reception with all allies having reached Emotion Level 5.
Effect: 4% chance to boost Stagger damage by +1 when engaging a character with 15+ Burn

Note: This one doesn't seem to have a visual.

Acquire: During a single Act of a Star of the City-level reception, deal 36 Stagger damage through the ability of "Uncanny Strike."
Effect: 5% chance to boost Stagger damage by +1 on Scenes where Charge was spent

Acquire: Defeat Lulu 1 times in the second episode of Streetlight Office encounter with Book of Mars equipped.
Effect: 2% chance to boost Slash dice Power by +1

Acquire: Inflict Bleed 3 times using combat pages from Pierre's Bistro
Effect: 5% chance to boost Slash attack damage by +1

Tip: The conditions for unlocking this is deceptively tricky. After some testing it seems that the only card that counts for this is Cooking Prep. You also have to inflict bleeding three times in the same encounter, and if you kill the opponent with the attack that was meant to cause bleeding, it doesn't count. You don't have to have Pierre's page equipped to get this symbol. If you're trying to get this symbol, I recommend putting 3x Cooking Prep on the character you want to unlock this on and only have that character attack on Yun's Office third episode. (The enemies there are weak enough to lose to Cooking Prep consistently, yet tanky enough to not get killed by it outright).

Acquire: In Urban Plague-level receptions, defeat 1 enemy via Bleed.
Effect: 5% chance to boost Slash attack damage by +1

Acquire: Inflict 10 or more Bleed to self with Jikan's Key Page equipped.
Effect: 5% chance to boost attack damage by +1 while the character has 5+ Bleed

Acquire: Win 10 clashes using Evade dice while the character's HP is at 25% or lower.
Effect: 4% chance to boost Defensive dice Power by +2 while HP is at 25% or lower

Acquire: During a single Act of an Urban Nightmare-level reception, become Immobilized via "Overcharge" 3 times.
Effect: Stagger Resist +2

Acquire: Survive through a complete reception of the Crying Children.
Effect: 2% chance to boost Ranged dice Power by +1

Acquire: During a single Act of a Star of the City-level reception, inflict 30 or more stacks of Burn.
Effect: 4% chance to boost attack damage by +1 when attacking a character with 15+ Burn

Acquire: Complete the reception of Xiao after activating the effect of "Reversed Scale" 1 time.
Effect: 4% chance to boost Pierce dice Power by +1 when attacking a target with 20+ Burn

Acquire: With Xiao or Lowell's page equipped, complete 1 Star of the City-reception alongside a librarian who has the significant other's Key Page equipped. (Both characters must survive)
Effect: 6% chance to boost Stagger damage by +3 while equipping Xiao or Lowell's Key Page and another librarian on the same floor has the other's Key Page equipped.

Acquire: During the Hook Office encounter, inflict Bleed 3 times.
Effect: 5% chance to boost Pierce attack damage by +1

Acquire: During the Stray Dogs encounter, deal 20 or more damage in a single act.
Effect: 5% chance to boost Blunt attack damage by +1

Acquire: Win 1 battles with Yun's Key Page equipped.
Effect: 1% chance to boost Evade dice Power by +1

Acquire: In a single Act of an Urban Plague-level reception, inflict 10 stacks of Burn using Dawn Office Combat pages.
Effect: 2% to boost Slash dice Power by +1

Tip: Feather Shield and Searing Sword does NOT count towards this Symbol. Also I can't for the life of me get this symbol while equipping Salvador's page, but I was able to get it while using Dawn office cards on any other key page.

Acquire: Defeat Philip in both Dawn Office and Wedge Office receptions with Oscar's Page equipped.
Effect: Stagger Resist +2

Tip: You don't have to defeat Philip in the first floor of the Wedge Office battle, only the second.

Acquire: In an Urban Plague reception, use "Ink Over" with 7 pages in hand.
Effect: 5% chance to boost Slash attack damage by +1 when attacking a target with 10+ Bleed

Acquire: During a single Act of an Urban Plague-level reception, win 10 clashes with a Workshop-affiliated Fixer’s Key Page equipped.
Effect: 5% chance to boost Pierce attack damage by +1

Acquire: During a single Act of an Urban Plague-level reception, activate the effect of the Combat page "Sakura" 3 times.
Effect: 4% chance to boost Stagger damage by +1 if the character discarded a page last Scene

Note: This one doesn't seem to have a visual.

Acquire: Use Der Freischütz's Abnormality or E.G.O pages 10 times.
Effect: While possessing Der Freischütz's Abnormality page, 4% chance to boost Offensive dice Power by +1

Acquire: Defeat Boris, Denis, Katriel, and Thumb Soldatos 1 time each with Kalo's Key Page equipped.
Effect: 5% chance to boost attack damage by +4 if the character discarded a page last Scene

Acquire: Defeat 3 enemies using the Combat page "Discipline" in Star of the City-level receptions.
Effect: 5% chance to boost attack damage by +2 while unaffected by Power gain or loss

Acquire: Use the Combat Page 'Unlock-III' 1 time in Star of the City-level receptions.
Effect: 4% chance to boost Blunt dice Power by +1 when in the 'Blade Unlocked' state

Acquire: Defeat 5 targets at once using the Combat page "Ground Crash" in a Star of the City-level reception.
Effect: HP +3

Acquire: During a single Act of a Star of the City-level reception, spend Stagger Resist equal to the character's Max Stagger Resist with the Combat page "Pinpoint Breakthrough."
Effect: 6% chance to boost attack damage by +2 if the character was Immobilized last Scene

Acquire: In a single battle, take 5 or more hits from Julia or Isadora
Effect: HP +1

Tip: Julia only mostly uses Slash attacks, so equipping key pages that resist Slash damage can help you take more hits from her. Defeat San and the other Zwei member ASAP and let Julia go wild on your librarians.

Acquire: Have 5 or more effects applied to the character at once. (counts both buffs and debuffs)
Effect: Stagger Resist +2

Acquire: Use All-Around Helper's Abnormality or E.G.O pages 10 times.
Effect: While possessing All-Around Helper's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Defeat 5 enemies using Ranged Combat pages.
Effect: 5% chance to boost Pierce stagger damage by +1

Acquire: Use the Singing Machine's Abnormality or E.G.O pages 10 times.
Effect: While possessing the Singing Machine's Abnormality page, 5% chance to boost Stagger damage by +1

Acquire: During a single Act of a Star of the City-level reception, inflict 30 or more Bleed to a single target.
Effect: 4% chance to boost Slash dice Power by +1 when attacking a character with 20+ Bleed

Acquire: Defeat Bada with San's Key Page equipped.
Effect: HP +2

Acquire: During a single Act of a Star of the City-level reception, use all four of the Purple Tear's stances.
Effect: 5% chance to boost attack damage and Stagger damage by +2 while equipping the Purple Tear's Key Page

Note: The randomized stance at the start of the battle does not count for this symbol.

Acquire: During a single Act of a Star of the City-level reception, use Prescript pages generated by the passive ability "The Messenger" 4 times.
Effect: After selecting a Breakdown Abnormality page, 5% chance to boost attack damage by +1 and Stagger damage by +2

Acquire: Defeat Distorted Philip 1 time.
Effect: 4% chance to boost Offensive dice Power by +1 when attacking a target with 20+ Burn

Acquire: Defeat Distorted Eileen 1 time.
Effect: 4% chance to boost Offensive dice Power by +1 while this character has 10+ Smoke

Acquire: Defeat Distorted Greta 1 time.
Effect: 4% chance to boost Offensive dice Power by +1 when attacking a target with 20+ Bleed

Acquire: Defeat Distorted Bremen 1 time.
Effect: 5% chance to boost Offensive dice Power by +1 when attacking a target with 2+ status ailments

Acquire: Defeat Distorted Oswald 1 time.
Effect: 7% chance to boost Stagger damage by +7 if an Offensive dice rolls the max value

Note: Half the effect is hidden by the Speed Dice...

Acquire: Defeat Distorted Tanya 1 time.
Effect: After the passive ability "Guts" activates, 6% chance to boost Offensive dice Power by +1 for the rest of the reception

Acquire: Defeat Distorted Jae-Heon 1 time.
Effect: 5% chance to boost Defensive dice Power by +1 while there's an ally with the "Puppeteer’s Strings" status

Acquire: Defeat Distorted Elena 1 time.
Effect: 4% chance to boost Offensive dice Power by +1 if the character recovered HP last Scene

Acquire: Defeat Distorted Pluto 1 time.
Effect: 5% chance to boost Offensive dice Power by +1 while there's an ally with a "Contractual Obligation" status

Acquire: Defeat Argalia 1 time. (Both the normal and Distorted versions count)
Effect: 10% chance to boost attack damage and Stagger damage by +2 when the passive ability "Resonance" activates

Acquire: Defeat Distorted Argalia 1 time. (Both the normal and Distorted versions count)
Effect: 10% chance to boost dice Power by +1 when the ability "Resonance" activates

Acquire: Get killed by Lulu 1 times in the second episode of Streetlight Office encounter.
Effect: 5% chance to boost Blunt stagger damage by +1

Tip: Make sure to equip Key Pages which are weak to Blunt attacks as Lulu has a card that does 6 damage to herself every time it is used, so you can't let her hit you forever. Be sure to kill off Lulu's friends too so they don't accidentally steal her kill. It seems that dying to burn damage still counts for this symbol.

Acquire: In an Urban Legend-level battle, have 3 or more Endurance at once.
Effect: 2% chance to boost Block dice Power by +1

Tip: Have everyone use Combat Preparation on the same turn. Easy.

Acquire: Removed 5 dice in total using Stray Dog pages.
Effect: 2% chance to boost Blunt dice Power by +1

Tip: The requirements for this is a bit vague. I am pretty sure that the only card that can get you this symbol is Brawl. It has 4 dice on it, but it replaces them with dice from a random card in your hand. If its dice is replaced it with a card which has only 1 dice, it should count as removing 3 dice for this symbol.

Acquire: Use Scorched Girl's Abnormality or E.G.O pages 10 times.
Effect: While possessing Scorched Girl's Abnormality page, 5% chance to boost attack damage by +1.

Acquire: Use Happy Teddy Bear's Abnormality or E.G.O pages 10 times.
Effect: While possessing Happy Teddy Bear's Abnormality page, 5% chance to boost attack damage by +1.

Acquire: Use Child of the Galaxy's Abnormality or E.G.O pages 10 times.
Effect: While possessing Child of the Galaxy's Abnormality page, 5% chance to boost Stagger damage by +1.

Acquire: Use Today's Shy Look's Abnormality or E.G.O pages 10 times.
Effect: While possessing Today's Shy Look's Abnormality page, 4% chance to boost Defensive dice Power by +1

Acquire: Use Red Shoes' Abnormality or E.G.O pages 10 times.
Effect: While possessing Red Shoes' Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use the Heart of Aspiration's Abnormality or E.G.O pages 10 times.
Effect: While possessing the Heart of Aspiration's Abnormality page, 5% chance to boost attack damage by +1

Note: It seems only E.G.O pages count for this symbol and not Abnormality pages. Needs some verification.

Acquire: In a single Act of an Urban Plague-level reception, inflict Paralysis 5 times using Gaze Office pages.
Effect: 5% chance to boost Blunt attack damage by +1

Acquire: Using Ranged pages from Full-stop Office, lose clashes 5 times against Melee Combat pages. (Counted per page)
Effect: 5% chance to boost Ranged Stagger damage by +1

Acquire: Clear an Urban Plague-level reception with a Combat shelf comprised entirely of pages that only have Pierce and Block dice.
Effect: 5% chance to boost Pierce attack damage by +1

Note: It appears that this symbol is currently bugged. By going into a battle which only allows 3 librarians, the fourth benched librarian will consistently get this symbol at the end of the fight.

Acquire: Defeat Pameli 5 times with Pamela's Page equipped.
Effect: HP +1

Acquire: Deal damage to Oscar while his Unrelenting passive is active.
Effect: 4% chance to boost Pierce dice power by +1

Tip: The best way to get this is to save your powerful, heavy hitting cards like Crack of Dawn or Transpierce and when Oscar is staggered, use them all on him and pray to RNGesus. I'm not sure if simply using Boundary of Death works as I have yet to get it to proc. As a side note, the fatal blow that triggers his passive does count for this symbol. (I hit him for a perfect 36 with Crack of Dawn while he was at 30 HP and it dealt 11 damage to him.) With update 1.0.1.8, Smoke was added to the game. Utilizing this update's key & combat pages makes this symbol a lot easier to obtain!

Acquire: Lose clashes against the Combat page "Creak" 10 times.
Effect: 5% chance to boost Blunt attack damage by +2

Acquire: Defeat Noah with Emma's Key Page equipped.
Effect: 5% chance to boost Blunt attack damage by +1

Acquire: Defeat Noah after Emma has been defeated.
Effect: 5% chance to boost Ranged attack damage by +1

Acquire: Fail the ability of "Rip Space" with 10+ Charge.
Effect: 5% chance to boost Offensive dice Power by +1 on Scenes where Charge was spent

Acquire: Use the Fairy Festival's Abnormality or E.G.O pages 10 times.
Effect: While possessing the Fairy Festival's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use Queen Bee's Abnormality or E.G.O pages 10 times.
Effect: While possessing Queen Bee's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use Snow White's Apple's Abnormality or E.G.O pages 10 times.
Effect: While possessing Snow White's Apple's Abnormality page, 4% chance to boost Offensive dice Power by +1

Acquire: Use the Funeral of the Dead Butterflies' Abnormality or E.G.O pages 10 times.
Effect: While possessing the Funeral of the Dead Butterflies' Abnormality page, 5% chance to boost Stagger damage by +1

Acquire: Use Porrcubus's Abnormality or E.G.O pages 10 times.
Effect: While possessing Porrcubus's Abnormality page, 5% chance to boost Stagger damage by +1

Acquire: Use Alriune's Abnormality or E.G.O pages 10 times.
Effect: While possessing Alriune's Abnormality page, 5% chance to boost Stagger damage by +1

Acquire: Use the Silent Orchestra's Abnormality or E.G.O pages 10 times.
Effect: While possessing the Silent Orchestra's Abnormality page, 4% chance to boost Offensive dice Power by +1

Acquire: Use Laetitia's Abnormality or E.G.O pages 10 times.
Effect: While possessing Laetitia's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use Dream of a Black Swan's Abnormality or E.G.O pages 10 times.
Effect: While possessing Dream of a Black Swan's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use the Queen of Hatred's Abnormality or E.G.O pages 10 times.
Effect: While possessing the Queen of Hatred's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use the King of Greed's Abnormality or E.G.O pages 10 times.
Effect: While possessing the King of Greed's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use the Big Bad Wolf's Abnormality or E.G.O pages 10 times.
Effect: While possessing Big and Will be Bad Wolf's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Get hit by a max-rolled attack of the Combat page "Mind Whip" 3 times.
Effect: 6% chance to boost Stagger damage by +2 while the character has 20+ Charge

Acquire: Activate the passive ability 'Manipulator of Odds' of the Purple Tear's Key Page 5 times.
Effect: 5% chance to boost attack damage by +4 when Manipulator of Odds activates

Acquire: Defeat Myo in the second reception of R Corp. 1 time with the Red Mist's Key Page equipped or attributed.
Effect: 6% chance to boost damage and Stagger damage when Speed is 5 or higher

Acquire: Defeat 5 targets marked by the passive ability "Finishing Touch."
Effect: 5% chance to reduce incoming damage by 1 while the character has 20+ Charge

Acquire: Have 20 stacks of Burn during the reception of Xiao.
Effect: 4% chance to boost Slash dice Power by +1 when attacking a target with 20+ Burn

Acquire: Use the Servant of Wrath's Abnormality or E.G.O page 10 times.
Effect: While possessing the Servant of Wrath's Abnormality page, 5% chance to boost attack damage by +1.

Acquire: Use the Mountain of Smiling Bodies' Abnormality or E.G.O page 10 times.
Effect: While possessing the Mountain of Smiling Bodies' Abnormality page, 5% chance to boost attack damage by +1.

Acquire: Use Nothing There's Abnormality or E.G.O page 10 times.
Effect: While possessing Nothing There's Abnormality page, 4% chance to boost Offensive dice Power by +1

Acquire: Use the Road Home's Abnormality or E.G.O page 10 times.
Effect: While possessing Road Home/Scaredy Cat's Abnormality page, 5% chance to boost attack damage by +1.

Acquire: Use Ozma's Abnormality or E.G.O page 10 times.
Effect: While possessing Ozma's Abnormality page, 5% chance to boost Stagger damage by +1.

Acquire: Use the Adult who Tells Lies' Abnormality or E.G.O page 10 times.
Effect: While possessing the Adult who Tells Lies' Abnormality page, 4% chance to boost Defensive dice Power by +1.

Acquire: Use the Burrowing Heaven's Abnormality or E.G.O page 10 times.
Effect: While possessing the Burrowing Heaven's Abnormality page, 5% chance to boost attack damage by +1.

Acquire: Use WhiteNight's Abnormality or E.G.O page 10 times.
Effect: While possessing WhiteNight's Abnormality page, 4% chance to boost Offensive dice Power by +1.

Acquire: Use WhiteNight's Abnormality or E.G.O page 10 times.
Effect: While possessing WhiteNight's Abnormality page, 4% chance to boost Defensive dice Power by +1.

Acquire: Use Apocalypse Bird's Abnormality or E.G.O page 10 times.
Effect: While possessing WhiteNight's Abnormality page, 4% chance to boost Offensive dice Power by +1.

Acquire: Use the Snow Queen's Abnormality or E.G.O page 10 times.
Effect: While possessing the Snow Queen's Abnormality page, 4% chance to boost Defensive dice Power by +1

Acquire: Use Silent Girl's Abnormality or E.G.O page 10 times.
Effect: While possessing Silent Girl's Abnormality page, 4% chance to boost Offensive dice Power by +1

Acquire: Stagger enemies 3 times in a single battle.
Effect: 2% chance to boost stagger damage of each type by +1.

Acquire: Clear Urban Myth-level regular receptions 3 times.
Effect: HP +1, Stagger Resist +1

Acquire: Use the Price of Silence's Abnormality or E.G.O pages 10 times.
Effect: While possessing the Price of Silence's Abnormality page, 5% chance to boost attack damage by +1

Acquire: During the Rats encounter, defeat Pete, Lenny, and Mang-chi all with a single character.
Effect: HP +1

Acquire: Win a battle with 1% or less HP remaining.
Effect: HP +3

Tip: Let some weaklings hit your librarian until they are less than 0.01*MaxHP and then wipe the floor with them.

Acquire: Use Forsaken Murderer's Abnormality or E.G.O page 10 times.
Effect: While possessing Forsaken Murderer's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use Bloodbath's Abnormality or E.G.O page 10 times.
Effect: While possessing Bloodbath's Abnormality page, 5% chance to boost Stagger damage by +1

Note: It seems only E.G.O pages count for this symbol and not Abnormality pages. Needs some verification.

Acquire: Make 5 copies of Fascinating Fabric during battle.
Effect: 2% chance to boost Block dice Power by +1

Tip: Since Will Produce Fine Silk? gives Fascinating Fabric to both you and the opponent, you actually only need to use it 3 times to get this symbol.

Acquire: In an Urban Plague-level reception, have 5 Strength at once with Meow's page equipped.
Effect: 2% chance to boost Blunt dice power by +1

Tip: The easiest way to do this is have the librarian with Meow's page use Observe, and next turn, have everyone use The Red Notes or Unforgettable Melody. There is a small chance that the librarian with Meow's page won't get the strength from these cards but you can just simply try again or even run the fight with just two librarians to eliminate this possibility entirely.

Acquire: Win a clash against "Boundary of Death" using "Boundary of Death."
Effect: 4% chance to boost damage and Stagger damage by +4 while HP is at 25% or lower

Tip: If you have the passive abilities Manipulator of Odds or The Twelve Fixers, you can increase the chance of proccing the effect of Boundary of Death. You can also use the Abnormality page Funny Prank on Hod's floor.

Acquire: During a single Act of an Urban Nightmare-level reception, engage in a clash where both the librarian and the opponent have 10 or more Smoke.
Effect: 5% chance to boost attack damage by +1 while this character has 10+ Smoke

Acquire: Use the Knight of Despair's Abnormality or E.G.O pages 10 times.
Effect: While possessing the Knight of Despair's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use Warm-hearted Woodsman's Abnormality or E.G.O pages 10 times.
Effect: While possessing Warm-hearted Woodsman's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use Pinocchio's Abnormality or E.G.O pages 10 times.
Effect: While possessing Pinocchio's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Defeat 3 targets at once using the Combat page "Eradication" in a Star of the City-level reception.
Effect: 4% chance to boost Slash dice Power by +1 when in the "Blade Unlocked" state

Acquire: During a single Act of a Star of the City-level reception, destroy 3 Block dice with the passive ability "Chlnk in One’s Armor."
Effect: 5% chance to boost Pierce attack damage by +2, and Pierce Stagger damage by +1

Acquire: During a single Act of a Star of the City-level reception, gain 5 or more Protection in a single Scene with an Udjat's Key Page equipped.
Effect: 4% chance to boost Defensive dice Power by +1 while having Protection

Tip: You can easily stack Protection with cards like Ready Up! or Confrontation, passives like Hana for All or The Messenger and certain Abnormality pages that give huge chunk of Protection like Fervent Beats and Courage. Of course, the Udjat pages themselves can help you stack a lot too.

Acquire: Defeat Elena using Tomerry's Combat pages.(Both the normal and Distorted versions count)
Effect: 5% chance to boost attack damage by +2 if the character recovered HP last Scene

Acquire: Use Nosferatu's Abnormality or E.G.O pages 10 times.
Effect: While possessing Nosferatu's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use Big Bird's Abnormality or E.G.O pages 10 times.
Effect: While possessing Big Bird's Abnormality page, 5% chance to boost Stagger damage by +1

Acquire: Use Punishing Bird's Abnormality or E.G.O pages 10 times.
Effect: While possessing Punishing Bird's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use Judgement Bird's Abnormality or E.G.O pages 10 times.
Effect: While possessing Judgement Bird's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Use Apocalypse Bird's Abnormality or E.G.O pages 10 times.
Effect: While possessing Apocalypse Bird's Abnormality page, 4% chance to boost Defensive dice Power by +1

Acquire: Use Blue Star's Abnormality or E.G.O pages 10 times.
Effect: While possessing Blue Star's Abnormality page, 5% chance to boost Stagger damage by +1

Acquire: During the Brotherhood of Iron encounter, gain Paralysis 3 times.
Effect: HP -1, Stagger Resist +1

Tip: Using Charge Up! can speed this up tremendously.

Acquire: Use Fragment of the Universe's Abnormality or E.G.O page 10 times.
Effect: While possessing Fragment of the Universe's Abnormality page, 5% chance to boost Stagger damage by +1

Acquire: In a single Act of an Urban Plague-level reception, reduce the Cost of 'Binding Arms' to 1 without the help of other effects 1 times.
Effect: 5% chance to boost Blunt attack damage by +1

Tip: Using any of the Shi Association pages (preferably Valentin) lets you use To Overcome Crisis which gives you the light and card draw you need in order to mill your deck for Binding Arms. For the remaining 3 cards, I use Flash of Sunup.

Acquire: Defeat 3 enemies of Urban Plague grade with Dalloc's key page equipped.
Effect: Stagger Resist +1

Acquire: In a single Act of an Urban Plague-level reception, use 'Opportunity Spotted' against a Paralyzed target 3 times.
Effect: 5% chance to boost Slash attack damage by +1

Acquire: In a single Act of an Urban Plague-level reception, restore 6 Light from the effects of Combat pages.
Effect: Stagger Resist +1

Tip: Cards like Clean Up work too, despite looking like a Battle Symbol that is meant to be gotten with Hard Rehearsal.

Acquire: In a single Act of an Urban Plague-level reception, inflict Feeble 5 times with Mumu's page equipped.
Effect: 2% chance to boost Evade dice power by +1

Acquire: Activate the passive ability "Corpse Cleanup" 9 times in a single reception.
Effect: HP +3

Acquire: Activate "Persistence" 1 time in a single reception.
Effect: Stagger Resist +3

Acquire: Recycle the last die of "Trash Disposal" 7 times.
Effect: 5% chance to boost Pierce attack damage by +2

Tip: The passive The Twelve Fixers guarantees the dice will recycle as long as you are below Emotion Level 3, using Clone and card draw passives like Battle Ready will help you to be able to use Trash Disposal twice before hitting Emotion Level 3 if you decide to use this strategy.

Acquire: In a single reception, use the Combat page "To Claim Their Bones" 2 times.
Effect: 5% chance to boost Slash attack damage by +2

Acquire: Use the Spider Bud's Abnormality or E.G.O page 10 times.
Effect: While possessing the Spider Bud's Abnormality page, 5% chance to boost Stagger damage by +1

Acquire: Use Little Red Riding Hooded Mercenary's Abnormality or E.G.O page 10 times.
Effect: While possessing Little Red Riding Hooded Mercenary's Abnormality page, 5% chance to boost attack damage by +1

Acquire: Destroy 3 dice using the Combat page "Energy Beam" in Star of the City-level receptions.
Effect: 4% chance to boost Defensive dice Power by +1 while this character has 10+ Charge

Acquire: During a single Act of a Star of the City-level reception, deal 40 or more damage to a target with 10+ Smoke in a single attack.
Effect: 5% chance to boost attack damage by +1 when attacking a target with 10+ Smoke

Acquire: In either reception of R Corp, defeat 1 Reindeer Team Soldier wearing a type-1 helmet.
Effect: 4% chance to boost Pierce dice Power by +1 while the character has +20 Charge

Acquire: In either reception of R Corp, defeat 1 Reindeer Team Soldier wearing a type-2 helmet.
Effect: 4% chance to boost Pierce dice Power by +1 while the character has +20 Charge

Acquire: In either reception of R Corp, defeat 1 Reindeer Team Soldier wearing a type-3 helmet.
Effect: 4% chance to boost Pierce dice Power by +1 while the character has +20 Charge

Acquire: In either reception of R Corp, defeat 1 Rhino Team Soldier wearing a type-2 helmet.
Effect: 4% chance to boost Blunt dice Power by +1 while the character has +20 Charge

Acquire: In either reception of R Corp, defeat 1 Rhino Team Soldier wearing a type-3 helmet.
Effect: 4% chance to boost Blunt dice Power by +1 while the character has +20 Charge

Acquire: In either reception of R Corp, defeat 1 Rabbit Team Soldier wearing a type-1 helmet.
Effect: 4% chance to boost Slash dice Power by +1 while the character has +20 Charge

Acquire: In either reception of R Corp, defeat 1 Rabbit Team Soldier wearing a type-2 helmet.
Effect: 4% chance to boost Slash dice Power by +1 while the character has +20 Charge

Acquire: Defeat Kali as Gebura
Effect: 6% chance to boost all attack damage by +1 during the E.G.O manifestation state

Acquire: During a single Act of a Star of the City-level reception, deal 60 or more damage to a target with 10+ Smoke in a single attack.
Effect: 5% chance to boost attack damage and Stagger damage by +1 if target has 10+ Smoke

Acquire: Defeat Philip with both Salvador and Yuna's Key Pages attributed. (Both the normal and Distorted versions count)
Effect: 4% chance to boost Offensive dice Power by +1 while inflicted with Burn

Acquire: Defeat Eileen with either one of Liwei, Tamaki, or Stephan's Key Pages equipped or attributed. (Both the normal and Distorted versions count)
Effect: 5% chance to boost attack damage and Stagger damage by +2 if target has 10+ Smoke

Acquire: Defeat Greta with Pierre's Key Page equipped or attributed. (Both the normal and Distorted versions count)
Effect: 5% chance to boost attack damage by +3 when attacking a target with 20+ Bleed

Acquire: Defeat Bremen with either one of Meow, MuMu, or Oink's Key Pages equipped or attributed. (Both the normal and Distorted versions count)
Effect: 6% chance to boost Stagger damage by +4 when engaging a target with 2+ status ailments

Acquire: Defeat Oswald with Emma's Key Page equipped or attributed. (Both the normal and Distorted versions count)
Effect: 1% chance to boost Stagger damage by +20

Acquire: Defeat Tanya with either one of Sayo, Yang, or Gin's Key Pages equipped or attributed. (Both the normal and Distorted versions count)
Effect: After the passive ability "Guts" activates, 8% chance to boost attack damage by +4 for the rest of the reception

Acquire: Defeat Jae-heon with a Puppet's Key Page equipped or attributed. (Both the normal and Distorted versions count)
Effect: 5% chance to reduce incoming damage by 1 while there's an ally with the "Puppeteer’s Strings" status

Acquire: Defeat Pluto with either one of Nemo, Bada, or Martina's Key Pages equipped or attributed. (Both the normal and Distorted versions count)
Effect: 5% chance to boost attack damage by +4 while there's an ally with a "Contractual Obligation" status

Note: It appears attributing will not get you this symbol as of now.

Acquire: Use the Jester of Nihil's Abnormality or E.G.O page 10 times.
Effect: While possessing the Jester of Nihil's Abnormality page, 4% chance to boost Offensive dice Power by +1