Jackknife Set
A mobile platform set in which one corner of its base is anchored so it can swing in an arc onto the stage. A jackknife set requires considerable room in the wing it is in when it is not on the stage. Also known as a Jackknife Stage.

Jog
A narrow flat which is often used at a right angle with another flat to create a corner and give an illusion of thickness, such as for a stone wall.

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