Program allowing a manufacturer to place Underwriters Laboratories Inc. labels on his products that have met UL requirements. A UL representative visits the manufacturing location to obtain samples of the products for testing by UL. In some cases, samples are also purchased on the open market for testing. The public is thereby assured that products bearing the UL label continually meet UL specifications.

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Knot

In lumber, the portion of a branch or limb of a tree that appears on the edge or face of the piece.

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Kinetic Energy

The energy of a body with respect to the motion of the body.

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Laminated Veneer Lumber

A structural lumber manufactured from wood veneers so that the grain of all veneers runs parallel to the axis of the member.

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Laminated shingles

Shingles that have added dimensionality because of extra layers or tabs, giving a shake-like appearance. May also be called "architectural shingles" or "three-dimensional shingles."

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Laminated Glass

Glass panels that have outer layers of glass laminated to an inner layer of transparent plastic.

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Landing Zone, Elevator

The area 18 inches (5490 mm) above or below the landing floor.

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Latch

- A beveled metal tongue operated by a spring-loaded knob or lever. The tongue's bevel lets you close the door and engage the locking mechanism, if any, without using a key. Contrasts with dead bolt.

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Landing

A platform between flights of stairs or at the termination of a flight of stairs. Often used when stairs change direction. Normally no less than 3 ft. X 3 ft. square.