Refrigerated semi trailer: heavy truck for transporting goods that must be kept cold.
Refrigeration unit: cooling apparatus.
Vent door: movable panels used to regulate air intake.
Clearance light: lights that indicate the form and dimensions of a vehicle.
Upper side-rail: beam that runs the length of the upper frame.
Rear reflector: light-reflecting device that marks the back end.
Lower side-rail: beam that runs the length of the lower frame.
Support leg: support that holds the semitrailer in a horizontal position.
Sand shoe: piece of metal that protects the end of the support leg.
Front reflector: light-reflecting device that marks the front end.

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A bell is a simple sound-making device. The bell is a percussion instrument and an idiophone. Its form is usually an open-ended hollow drum which resonates upon being struck. The striking implement can be a tongue suspended within the bell, known as a clapper, a small, free sphere enclosed within the body of the bell, or a separate mallet. Bells are usually made of cast metal, but small bells can also be made from ceramic or glass. Bells can be of all sizes: from tiny dress accessories to church bells weighing many tons.

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