Back in the U.S. Navy of the 60's ships were given several different calls. In my ship's case we had:
NBIG - the "official" call sign. This was not used in voice or TTY communication but was used in morse code and semaphore.
"Stale Vessel" - the "voice" (tactical, ship-to-ship) call sign. Used only in voice communication usually by bridge personnel.
The captain objected to the initial voice call and got it changed to "Stage Door".

With all the branding going on now and digital readouts on virtually all radios it seems kind of silly to require stations to identify themselves by calls any longer. We use frequencies to find the stations and brands to identify their formats. Calls seem so 20th century.