It looks like they wrote with a silver sharpie on black paper.
QC Chemist
It looks like they wrote with a silver sharpie on black paper.
That’s what I figured it was when I was a kid. Same letters as the compass rose, information from around the world.
It became a short-lived fad back in the mid 90’s when I was in college. The goth and art kids leaving messages on dorm doors using black sticky notes written in silver sharpie marker. Not like we had texting yet.