U-channel

A flat piece of metal with two edges turned up at right angles in the same direction, i.e., in the shape of a U when seen from the end of the metal. Used in automobile frames to give strength. Sometimes two U-channels are nested together to create a box called a Box section construction

UCI

Abbreviation for Union Cycliste International the international governing body of professional and amateur bicycle racing

U-cylinder engine

See

• Twin-piston engine

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