Comment by curiousfab

Interestingly Wikipedia says the Morse version of it is

  Morse code "dah-di-di-dah-di, dah-dit" ( –··–·   –· )

IMHO more common is to send "ESE" (. ... .) - and the other station replies "EE" (. .)

https://lcwo.net/ext/player?z=MjR%2BfjIwfn42MDB%2BfkVTRSBFRQ...

"ESE" is a popular Amateur radio call-sign suffix among Morse enthusiasts for that reason.