1. Scenic. A trapezoidal-shaped scab of plywood reinforcing the toggle to stile joint on a Broadway-style flat.
2. Architecture. The top center element of an arch.
3. Projection. The geometric distortion of an image when the projector is not perpendicular on both vertical and horizontal axes to the projection surface. Most video projectors have a provision for some degree of electronic keystone correction.
4. Wiring. A standard connector plate/housing and snap-in component system, available from a wide variety of manufacturers and interchangeable.

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