Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by US public safety officials and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code.[1]

One of the most frequently used ten-codes, 10-4, has become popular enough to sometimes be used in every-day language. Clear to copy transmission? A list of Police Radio 10-Codes and their meanings.

2018年8月2日 · 10-4 is one of the so-called ten-codes, or radio signals, invented by the Association of Public-Safety Communications Officials-International (APCO). 10-4 is an affirmative signal: it means “OK.”

2024年3月21日 · In essence, 10-4 just means "message received" or "OK." There are other ways to communicate the same thing over radios and walkie talkies that don't require the 10 codes. It's also common to say "copy" or "over."

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