Mortise A recess cut into the surface or edge of a part, usually for the purpose of housing hardware such as hinges, latch plates etc.
Mortise-Type Lock A lock-set which usually has a rectangular-shaped mechanism, which is housed into a deep recess cut into the edge of a door.
Mullion A post or divider which runs from sill to frame top in a multi-panel door, or door and sidelite assembly. In stile and rail doors, the vertical wood parts which separate panels,
NRP Hinge An abbreviation for a hinge with a non-removable pivot pin. NRP hinges are used when exterior doors swing out, as a security feature. The fixed pins make it impossible to remove a door by driving out pivot pins.
Outswing An exterior door assembly in which the door panel swings outside the building.