Industry Terms:

DG – Dangerous Goods

DGR – Dangerous Goods Regulations

HM – Hazardous Materials (“HazMat”)

HMR – Hazardous Materials Regulations

NA ID # –  North American Identification Number
(refers to 4-digit codes which represent a proper shipping name of a hazardous material, used only in US, recognized in Canada; not for international use)

NOS or N.O.S. – not otherwise specified (refers to generic hazardous materials)

SP or DOT-SP: US DOT Special Permit, an alternative way to comply with regulations

UN ID # –  United Nations Identification Number
(refers to 4-digit codes which represent an internationally recognized proper shipping name of a hazardous material)

VOCs – Volatile Organic Compounds – emissions or vapors from petroleum products


DOT or US DOT – United States Department of Transportation

FMCSA – Federal Motor Carrier Safety Administration

FRA – Federal Railroad Administration

IATA – International Air Transport Association

ICAO – International Civil Aviation Organization

IMDG – International Maritime Dangerous Goods Code

IMO – International Maritime Organization

MARAD – Maritime Administration

PHMSA – Pipeline and Hazardous Materials Safety Administration

TC – Transport Canada

TSB – Canadian Transportation Safety Board

USCG – United States Coast Guard

Rulemaking Terms:

ANPRM – Advanced Notice of Proposed Rulemaking

NPRM – Notice of Proposed Rulemaking

EO – Emergency Order

FR – Final Rule or Federal Register, depending upon how it’s used

MAP-21 – Moving Ahead for Progress in the 21st Century – a collection of requirements set forth by the US Congress which mandates that the agencies of DOT must implement certain new procedures or requirements, among other things, by a specific date.

SA – Safety Advisory