halo 3:ODST alien glyph

ive came across some alien glyph that only appear will having night vision on

still haven’t found what they do or why they are there

tried interracting with them but nothing happen.

here some screenshot i took

without night vision

with night vision

They were in the original 360 version dude. I can’t remember if they do anything or not. I don’t think that they do.

been so long since i played halo 3 odst, don’t remember seeing these in the original version

Engineers leave those symbols all around the city.