Here’s a quick introduction to a useful feature.

While exploring dungeons, click the mouse wheel button
(Press and hold the controller's RB (R1) button)
to access the Emote Interaction menu.

You can use it to ping objects to teammates, call for regrouping,
alert others to enemies, and perform a variety of emote animations.
There are many ways to use it, so Stalkers—be sure to take advantage of it!

You can customize the emote settings in the Stalkers Menu under Actions.