McD and Airbus persisted in calling them "throttles" (holdover from piston jargon), while Boeing started the more generic "thrust lever" jargon. Why they didn't call 'em "speeder spring lever" is anybody's guess, but in the day of hydromechanical controls, that's exactly what they did. Ham Standard, Bendix, Woodward, and I'm sure many others used flyweight governors to control rotor speed and thus thrust.