Callsign

call sign
noun
noun: callsign
a message, code, or tune that is broadcast by radio to identify the broadcaster or transmitter.
NOT how you refer to someone.

"hey, callsign four_leaf, that's a pretty cool username"
"thanks, but you can call me "four leaf" or "Daniel"

"can't i just call you "callsign"?"
"fucking no, you cannot"

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