What does "12" mean? I get 1312 but 12?

[nolabear]

[The Velveteen Ocelot]

1. Context, please?

[greenjar_01]

5. Lots of graffiti and signs say "Fuck 12"

[Tipperary]

6. I have seen it too. Fuck 12 graffiti everywhere.

Not being a cool kid, I had to google it.

[Tipperary]

2. I had to google it.

It means police.

[tishaLA]

3. Cops. Like Adam-12

[nolabear]

8. Oooooooooohhhhhh...of course! It's been so long.

[greenjar_01]

4. Fuck 12 means Fuck the Police

Not sure of the provenance, but that's been a saying for a while.

[PoliticAverse]

7. The Urban Dictionary is the place to go for quick explanations of most slang...

https://www.urbandictionary.com/define.php?term=Fuck%2012