Ham Radio Q-signs

Ten-codes are forms of verbal shorthand that have arisen informally; a number of standardization efforts have been made by various radio organizations. The FCC requires CB-ers to keep a written list of the codes with the CB set if they use CB codes at all. Law enforcement uses a similar but not quite identical set of codes.

Code	CB Meaning	Police Meaning
10-0	[Not used]	Caution
10-1	Signal weak / Receiving poorly	Unable to copy -- change location
10-2	Signal strong / Receiving well
10-3	Stop transmitting
10-4	Acknowledge / Yes / Okay
10-5	Relay message [to ...]
10-6	Busy
10-7	(Going) out of service
10-8	In service
10-9	Repeat
10-10	Transmission complete or no	Fight in progress

(list under construction)

A related shorthand is the Q-signs.