It is common in Dutch, short for casu quo (latin).
"A c.q. B" means something like "A or otherwise B" (example translated from Dutch wikipedia page)
"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.