Nanogram - One billionth of a gram
Niger - MARC country of publication code - Library of Congress (LCCP)
Ngoko - Linguistics (IEL)
Gill Aviation Ltd. (SAUS)
Green Hills Aviation - ICAO designator (AD)
Narrow Gage (NAKS)
Narrow Gauge
Nasogastric - Medicine
National Gallery - London
National Gathering - Jordan - A publication (BJA)
National Grange (EA)
National Grid - British Ordnance Survey maps
National Guard - or Guardsman
Natural Gas
Natural Gas Shutoff - NFPA pre-fire planning symbol (NFPA)
Natural, Grazed - Agriculture
Naval Gunfire (SAA)
Navy General - MCD files
NAZI Government (BJA)
Negative Glow (IDOE)
Negotiate - Telegraphy (PCTE)
Neopentyl Glycol - Organic chemistry
Nephridial Gland
New Game - Internet lingo
New Genus
New Gnostics Special Interest Group (EA)
New Granada
New Group
New Growth - Medicine (EDAA)
New Guinea
New Guy - Chat lingo
Newly Generated
Newsgroup (SAUS)
Next Generation (SAUS)
Niger - Federal Information Processing Standard (FIPS) country code (GEON)
Nigeria - ANSI two-letter standard code (CNC)
Nigeria - NCIC country-territory code (NCIC)
Nitrogen Gauge (MCD)
Nitroglycerin - Also, GTN, NTG - Explosive, vasodilator
Nitroguanidine - Organic chemistry
Noble Gases - Nuclear energy (NRCH)
Noble Grand
Noble Guard - Freemasonry (ROG)
Nodose Ganglion - Medicine (DB)
Nodular Goiter - Medicine (MELL)
No Go - i.e., an unacceptable arrangement
No Good - Similar to IC - Inspected and Condemned
No Growth - Medicine (EDAA)
No Gum - Philately
Non-Government (OTD)
Nongraduate
Non-Groupable - Medicine (EDAA)
Normal Graduate
Normoglycemia - Medicine (MELL)
Normotensive Group - Cardiology
Norwegian
Norwegium - Chemistry (ROG)
Nose Gear - Aviation (MCD)
Nose Guard (SAUS)
Not Given (ADA)
Not Good
Not Greater (SAUS)
Not Ground (SAUS)
Not Guilty
Nottingham - Postcode (ODBW)
No Window Glazing
Nuclear Galaxy (BARN)
Nut Grounds (SAUS)
Royal North Gloucestershire Militia - British military (DMA)
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