CQ in Morse Code
CQ is written as -.-. --.- in International Morse Code. A general call to any station, meaning "Seek You". Still widely used by amateur radio operators to initiate a contact on a frequency.
Originating in the early 20th century, CQ was used by telegraphers to indicate they were looking for a conversation with anyone listening. Still widely used by amateur radio operators to initiate a contact on a frequency.