Small black triangles on the cabin wall, between windows and bottom of luggage racks in a A320.



Now, the sharp eyed will notice this is a Pacific Airlines aeroplane but they were exactly the same on my BA flight to OSL a few days ago. I was sitting further back on the BA A320 and as we disembarked from the rear could not get a photo.

Above rows 9/10. Same position on starboard and I did not spot any others elsewhere. They can’t be curtain markers as no magic boundary on Pacific Airlines.