This glossary was compiled by Don B at jaguarforums.com and is reproduced here
with his permission
N = Neutral or Nitrogen
NA or N/A =Normally (or Naturally) Aspirated (as opposed to Supercharged or SC), or Not-Applicable
NATEF = National Automotive Technician’s Education Foundation
NAV = Navigation System, Navigation Control Module (NCM, GPS)
Nave Plate = Hubcap
NAS = North American Specification
NC or N.C. = Normally Closed (see NO)
NCM = Navigation Control Module (NAV)
Near Side = Driver’s Side (NS, DS), see Off Side
New Old Stock = Unused older manufacture as opposed to modern reproduction (NOS)
Newton Metre = Unit of torque (ft.lbs., ft·lb, lb.ft., lb·ft, Foot-Pounds, Pound-Feet, Nm, N·m)
NHTSA = National Highway Travel Safety Administration (U.S.)
NIASE = National Institute for Automotive Service Excellence, commonly known by ASE
Nick, In Good Nick = In good condition
Nikasil = Electrodeposited lipophilic nickel matrix silicon carbide; problematic cylinder coating
NLA = No Longer Available (seen in Jaguar parts listings)
Nm or N·m = Newton-metre Unit of torque (ft.lbs., ft·lb, lb.ft., lb·ft, Foot-Pounds, Pound-Feet)
NO or N.O. = Normally Open (see NC)
NOS = New Old Stock, unused older manufacture as opposed to modern reproduction
NOX or NOx = Oxides of Nitrogen, collectively Nitrogen Monoxide (NO) & Nitrogen Dioxide (NO2)
NS = Near Side
NSD = Neutral Sense Diode
NTC = Negative Temperature Coefficient
Number Plate = License Plate
Nut = An internally-threaded fastener, typically with a hex-shaped perimeter, used with a bolt or stud.
NVH = Noise, Vibration and Harshness
Nyloc Nut = Nut with a deforming Nylon insert that resists loosening due to vibration or shaft rotation
Nylock = Misspelling of Nyloc
Nylon = DuPont trademark for family of aliphatic polyamide thermoplastics first produced in 1935
Nylon, Brush = Brush Nylon headliner fabric used in Jaguars from 1971 to present