Useful theatrical slang is "doobrie" which is almost equivalent to "yoke" but not quite, since a doobrie is something you'll find on a set (which, admittedly, can be pretty much anything so "put the doobrie on the wotsit which sits on the thingummy" isn't much use to anyone who hasn't been on set for a while...) but I've just checked with young G. and he says I've never used "yoke" to him, but I have occasionally used "doobrie" but on the whole I use "thingy" or "wotsit" to him, on the grounds that otherwise he just doesn't understand.