Activator

Activator may mean: Activator (genetics), a DNA-binding protein that regulates one or more genes by increasing the rate of transcription
Activator (proteomics), a type of effector that increases the rate of enzyme mediated reactions
Sega Activator, a motion-sensing controller for the Sega Mega Drive/Genesis
Activator technique, a method of spinal adjustment
Activator, a hardcore band from Brooklyn, New York.