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.