Clicker
Clicker turns up in 2 fields: lighting, printing. Here is what it means to the people in each one.
Clicker in lighting
A handheld remote control used to advance cues or trigger practical effects.
A clicker is a wireless handheld transmitter used by speakers, stage managers, or technicians to manually advance slides, fire lighting cues, or toggle practical fixtures. While traditionally used for presentations, lighting crews often integrate the receiver into the control console via contact closures or MIDI so the talent can drive their own lighting changes directly from the stage.
"Tie the receiver into the console so the CEO's clicker fires the next lighting cue along with the slide."
Clicker in printing
A clicker is a historic term for a foreman or lead compositor who makes up the final pages.
A clicker was the lead compositor in a traditional print shop who received the copy, distributed it among the typesetters in a companionship, and then assembled their finished galleys into complete pages. The clicker was responsible for locking the type into the chase, adding the running heads and folios, and ensuring the final form was ready for the press.
"Hand your finished takes to the clicker so he can start making up the first sheet."