It means "best regards". In Morse code transmissions, a lot of words and phrases are shortened to commonly understood abbreviations and pro-signs. You can see a

It means "best regards". In Morse code transmissions, a lot of words and phrases are shortened to commonly understood abbreviations and pro-signs. You can see an example here: http://lidscw.org/resources/cq-qso-template http://lidscw.org/resources/cq-qso-template and a list of such abbreviations here: https://cwops.org/wp-content/uploads/2018/07/CW-Abbreviations.pdf https://cwops.org/wp-content/uploads/2018/07/CW-Abbreviation...