CQ
- CQ – (i) Carrier Qualification – Central Queensland – Charge of Quarters – Congressional Quarterly – Constellation Airlines (IATA airline designator) – Northern Mariana Islands (FIPS 10-4 territory code)
- CQD – (i) Close Quarters Drill (Morse distress code preceding SOS: CQ "calling all stations", D "Distress"; often incorrectly interpreted as "Come Quick, Distress")
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