In 1960, while doing the Airshow circuit, as the official RAF Display Squadron looping a formation of 14 Hunters, they were introduced as "Treble One Squadron".
I have never heard them being called otherwise.( Unless they were being called The Tremblers).
Squadrons can be pretty picky about their numbers. "Two One Four" was proud to use that definition, but "Two Sixteen" got very miffed if called " Two One Six".