Needle
A temporary large wooden beam which supports the section of a wall above an opening, before installing a permanent rolled steel joist or lintel.
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Neutral
The section of an electrical circuit which carries the flow of current back to source.
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Newel
The large post supporting a staircase handrail at the top and bottom of stairs. Also, the central post of a spiral staircase.
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Nogging
Horizontal wooden infill inserted between joists.
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Nosing
Rounded edge of a stair tread which projects beyond the riser below.
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