What is the 10 4? a couple weeks ago. i saw a drama. (that drama is about FBI.) in drama, sometime..actor said that "10 4 (ten four)". ㅡ_ㅡa What is a "10 4"? What means is it?

Yoon

Answers · 2

It is a police code meaning "message understood".

Radio lingo for for 'message received' or understood.

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