The following symbols, acronyms, and abbreviations apply to this part:

°C      degrees Celsius.

ASTM      American Society for Testing and Materials.

cc      cubic centimeters.

CFR      Code of Federal Regulations.

cm      centimeter.

CO      carbon monoxide.

CO2      carbon dioxide.

EPA      Environmental Protection Agency.

g/kW-hr      grams per kilowatt-hour.

HC      hydrocarbon.

ISO      International Organization for Standardization.

kPa      kilopascals.

kW      kilowatts.

LPG      liquefied petroleum gas.

m      meters.

MIL      malfunction-indicator light.

mm Hg      millimeters of mercury.

NMHC      nonmethane hydrocarbons.

NOX      oxides of nitrogen (NO and NO2).

psi      pounds per square inch of absolute pressure.

psig      pounds per square inch of gauge pressure.

rpm      revolutions per minute.

SAE      Society of Automotive Engineers.

SI      spark-ignition.

THC      total hydrocarbon.

THCE      total hydrocarbon equivalent.

U.S.C.      United States Code.