N

Neutral

The wire in an electrical system (usually white) that carries current when there is unbalance load.

Newel

A post supporting the handrail at the top or bottom of a stairway.

Niche

A recess in a wall, usually designed to contain ornamental statues or other decorations.

Nominal Size

The size of lumber before dressing, rather than its actual size.

Nonbearing Wall

A wall supporting no load other than its own weight.

Nosing

The rounded edge of a stair treads.