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The '''Q-code''' is a standardised collection of three-letter codes that each start with the letter "Q". It is an [[Operating signals|operating signal]] initially developed for commercial [[radiotelegraphy|radiotelegraph]] communication and later adopted by other radio services, especially [[amateur radio]]. To distinguish the use of a Q-code transmitted as a question from the same Q-code transmitted as a statement, operators either prefixed it with the military network question marker "{{overline|INT}}" ({{morse|dot|dot|dash|dot|dash}}) or suffixed it with the standard Morse question mark {{overline|UD}} ({{morse|dot|dot|dash|dash|dot|dot}}).
Although Q-codes were created when radio used [[Morse code]] exclusively, they continued to be employed after the introduction of voice transmissions. To avoid confusion, transmitter [[call sign]]s are restricted;
Codes in the range QAA–QNZ are reserved for aeronautical use; QOA–QQZ for maritime use and QRA–QUZ for all services.
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