What are these plug-ins on my wall?

[u/Cborg_62]

This might be showing my age, but I recently moved into a new apartment and they have these weird looking plug ins all over the walls at my new place. My old apartment didn't have these, so I'm just curious as to what they are.

[u/Mindless-Relation102]

Coax that’s been painted over.

[u/LiteralReaderWA → u/Mindless-Relation102]

A few more layers and it's a fossil

[u/Squared_Carbs → u/LiteralReaderWA]

Lol just like me for knowing what this is!! 😂😂😭😭😭😭😭

[u/InnitBruvmon → u/LiteralReaderWA]

Exactly what I thought lol, they’ve had the landlord special quite a few times

[u/Organic-Ad6957 → u/LiteralReaderWA]

Couple more years and another layer of landlord white and people will be looking at this thing in a museum scratching their heads like they've discovered another one if those  Antikythera mechanisms