CQ
1 of 2communications code abbreviation
ˈsē-ˈkyü 
—used at the beginning of messages of general information or safety notices or by shortwave amateurs as an invitation to talk to other shortwave amateurs
CQ
2 of 2abbreviation
1
charge of quarters
2
commercial quality
Word History
Etymology
Communications code abbreviation
call to quarters
First Known Use
Communications Code Abbreviation
1924, in the meaning defined above