What is this?
I’m not rocket surgeon but it looks like a normal normal texture square.
There are ALOT of things like this ingame from textures like you and others have found, including myself, to weapons or armor or items that are named “Name me later” or “To be renamed”, or this one “This sword has no name”. Thousands of these unfinished details saturate this world because work piled up and devs did not communicate with each other or departments failed to notify each other….or they simply forgot, laugh.
These can be catagorized as just another one of those things.
There is no worse feeling than that during an argument, you realize you are wrong.