What does the amateur radio term 'CQ' mean when transmitted?

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CQ is a general call inviting any listening station to respond, and it originates from the French word "sécurité" meaning safety or attention. When a ham radio(Deals) operator calls CQ, they are essentially saying "I am available and looking for someone to talk to on this frequency." During contests, operators rapidly call CQ to make as many contacts as possible, sometimes logging hundreds of stations in a single weekend.

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