"C.Q." is an abbreviation that could mean different things depending on the context. It is not a widely recognized or commonly used abbreviation, and its meaning is not immediately clear. Can you provide some more information or context about it?
"A c.q. B" means something like "A or otherwise B" (example translated from Dutch wikipedia page)
it's strange how a language that absorbs everything it comes across didn't bag this, perhaps there something else in english that does the same job?
If you hear "CQ CQ CQ de WB6NOA" being transmitted, it would mean the person who owns call sign WB6NOA is looking to talk to someone on this frequency.