N02 - Nitrogen dioxide
N0X - Nitrogen oxides
NAAQS - National Ambient Air Quality Standards
NACE - national Association of Corrosion Engineers
NAFTA - North American Free Trade Agreement
NAPF - Non Aqueous Phase Fluid
NAS – National Aerospace Standard
NASA - Non Active Side Arm
NAVTEX - navigational and meteorological warning broadcast service
NBstb - Near Bit Stbeliser
NCOB - no cargo on board
NDT - non-destructive testing
NE - Northeast
NEB =National Energy Board
NFI - No Further Investment
NFPA – National Fire Prevention Association
NFTZ - non free trade zone
NG - Natural Gas
NGL - Natural Gas Liquids
NGO - Non-Governmental organisation
NHPV - Net Hydrocarbon Pore Volume
NI - The Nautical Institute
NIHQ - Nautical Institute Headquarters, London
NITC - Normal Incremental Transfer Capability
NK or NKK (or ClassNK) - Nippon Kaiji Kyokai (Japan's ship classification society)
NM - Nautical mile
NMEA - National Marine Electronics Association
NMFS - National Marine Fisheries Services (NOAA Fisheries)
NMR - nuclear magnetic resonance
NNR - national nature reserve
NO - nitric oxide
NOAA - National Marine and Atmospheric Administration
NOC - national oil company
NOD - Notice of Determination
NOGEPA - Netherlands Oil and Gas Exploration and Production Association
NOI - Notice Of Inquiry
NOI - Notice Of Intent
NOP - Notice of Preparation
NOR - Notice of Readiness
NOV - National Oilwell Varco
NP - Neutral Point
NPD - Norwegian Petroleum Directorate
NPDES - National Pollutant Discharge Elimination System
NPREP - National Preparedness for Response Exercise Program
NPSH - Net Positive Suction Head
NPT - Non Productive Time
NPV - Net Present Value
NPV - Net Present Value
NRC - National Response Center
NRI - Net Revenue Interest
NRV - Non Return Valve
NSA - Norwegian Shipowners' Association
NSDG - North Sea Decommissioning Group
NT - net tonnage
NTHF - Non-Toxic High Flash
NTO - National Training Organization
NTU - Nephelometric Turbidity Unit
NUMAST - National Union of Marine, Aviation & Shipping Transport Officers
NWI - Net Working Interest
NYMEX - New York Mercantile Exchange
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