It's an object capable of creating doors that, when connected via wiring, can teleport. They exist in 3 types: manual, touch, and code. Manual only requires interaction to teleport, touch only requires touching, and code requires entering a specific code to teleport. There are 96 types of doors, many of which are from the base game; the rest are from required mods and third-party mods. I would like to inform the author of these sprites that they should please leave their name here so I can add it, as I previously used this mod as a homemade version for my own use. Okay?
Please authors feel free to contact me to remove or add your names to specific sprites, okay?