73s

seven-three

slang Take care; best regards. A common sign-off phrase used in amateur radio (also known as "ham radio"). A verbalization of the number 73, thought to be derived from early American telegraph codes. That's it for me for tonight. Seven-three de Pat Hawson.

seventy-three

slang Take care; best regards. A common sign-off phrase used in amateur radio (also known as "ham radio"). A verbalization of the number 73, thought to be derived from early American telegraph codes. That's it for me for tonight. Seventy-three de Pat Hawson.
Farlex Dictionary of Idioms.
See also:
  • 73
  • seven-three
  • seventy-three
  • as one does
  • as you do
  • all the best
  • as regards
  • as regards somebody/something
  • (something), thy name is (someone or something)
  • average Jane