Morse code

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Morse Code is a method for transmitting information, using standardized sequences of short and long marks or pulses -- commonly known as "dots and dashes" -- for the letters, numerals and special characters of a message. Originally created for Samuel Morse's electric telegraph in the mid-1830s, it was also extensively used for early radio communication beginning in the 1890s.

CW Abbreviations and Q Signals

ADR address GN good night RIG station equipment
AGN again GND ground RPT repeat
BK break GUD good SK end of transmission
BN been HI the telegraphic laugh SRI sorry
C yes HR here SSB single side band
CL closing HV have TMW tomorrow
CUL see you later HW how TNX-TKS thanks
DE from (French) N no TU thank you
DX distance NR number UR your
ES and (French) NW now VY very
FB fine business OM old man WX weather
GA go ahead PSE please XYL wife
GB good bye PWR power YL young lady
GE good evening R received as transmitted 73 best regards
GM good morning RCVR receiver 88 love and kisses

International Q signals

And the International "Q" signals, recognizable in any language:
 

QRL Is the frequency busy? QRT stop sending
QRM interference QRX wait, standby
QRN noise, static QSB fading
QRO increase power QSL acknowledge receipt
QRP decrease power QSY change frequency
QRS send slower QTH location
Wait, stand by (AS) dit dah dit dit dit
Slash (DN) dah dit dit dah dit
End of message (AR) dit dah dit dah dit
End of contact (SK) dit dit dit dah dit dah
and of course, Break (BT) dah dit dit dit dah
Wikipedia:Morse Code