The structure is a simple number used as a coded noun for police officers, especially as a warning that they are nearby. People typically shout "twelve!" when spotting police at parties, in crowds, or during illegal activities to alert others. The exact origin is uncertain. The most credible theory connects it to the police radio code 10-12, which means "visitors are present" or "people on scene;" making it a logical warning term.

What does "twelve" mean in street slang?

英語での「twelve」の定義と意味

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