1. The side to side movement of a lighting fixture. Regularly used when speaking of the movement of a moving light fixtures, or a camera. 2. Shallow receptacle to catch and hold run-off: drip pan, oil pan, etc. 3. A piece of hardware mounted on the balcony rail to protect the heads of the audience members below in the expensive seats from falling color frames, etc. 4. A character in a J. M. Barrie play who often levitates.