Probably the most common one is satellite dishes. The parabolic shape of the dish causes reflected electromagnetic energy to "come together" at the focal point - where the feedhorn collects it and ducts it to the low noise amplifiers in the front end of the electronics.
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Some examples are a square, rectangle, that is all I know so far
Cube, pyramid, cone, cylinder.
Some examples of squares are chessboard, carom board, square rubber stamps, and tiles on the floor.
Examples of 3D shapes are all around, a milk bottle, a box of matches, an egg, to name but three.
Real-world examples of trapezoids include the faces of some roofs and some South American pyramid-like buildings; the shapes of some types of classroom tabletops; and the silhouettes of some handbags.