10-4
10-4 means "OK," "understood," and "affirmative." Commonly known as CB radio lingo, originating from the need for brevity in radio transmission.
Example:
me--"Is anyone there?"
respondent--" 10-4"(to indicate presence).
me--"Let's roll."
respondent--"10-4"(to indicate agreement).
me--"Is anyone there?"
respondent--" 10-4"(to indicate presence).
me--"Let's roll."
respondent--"10-4"(to indicate agreement).