What symbols, acronyms, and abbreviations does this part use?

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. CH 4 methane. cm centimeter. CO carbon monoxide. CO 2 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. N 2 O nitrous oxide. NARA National Archives and Records Administration. NMHC nonmethane hydrocarbons. NO X oxides of nitrogen (NO and NO 2 ). 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. [67 FR 68347, Nov. 8, 2002, as amended at 70 FR 40485, July 13, 2005; 74 FR 56510, Oct. 30, 2009]