It's unique, because you want a unique signal for a unique situation.
"All Out" or "Full Power" are phrases that wouldn't be misconstrued.
"NO" on the radio sounds very much like "GO". You should pull the
yellow handle and use "STOP" but in the heat of the moment...
Jim

What was the film about skydiving where someone had a load of laundry
instead of a chute, their friend found out, and wrote NO GO on the
ground, but read upside down it looked like GO ON????