Laminated glass: multi-layered glass with a layer of plastic between the glass layers - often used in sliding doors, and in hurricane prone areas, due to its resistance to breakage due to impact.

Lancet window: A Gothic-style window having a pointed arch at the top, sometimes including a diamond-shaped muntin pattern.

Lattice window: a window with diagonal muntins and diamond-shaped panes.

Lift: on a single or double-hung window, a handle mounted on the bottom rail of the inner sash for easier lifting.

Light (or Lite): the individual pane of glass in a window unit.

Low-emittance (Low-E) glass: glass which is coated to reduce radiant heat gain.

Lock rail: the horizontal section of a sash to which a cam lock is attached.

Lock stile: a vertical section of a sash to which a cam lock is attached.

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