TM  5-3805-262-20 List  Of  Abbreviations  (Cont) GAL Gallon GMP Gallons  per  minute H High H Hourly Hg Mercury HI High HR Hand  Receipt IGN Ignition IN Inch IN-LB Inch-pound L Low LB Pound LB-FT . Pound-foot LB-IN . Pound-inch LH Left hand LO Lubrication  Order M Monthly MAC Maintenance  Allocation  Chart MI Miles MOS Military  Occupational  Specialty MPH Miles per hour MTOE Modified  Table  of  Organization  and  Equipment MTR Motor N Neutral NATO North  Atlantic  Treaty  Organization NC National  coarse  thread NC Normally  closed NEUT . Neutral NF National  fine  thread NO Normally  open NO. Number NPT National  pipe  thread NPTC National  pipe  thread  coarse NPTF National pipe thread fine NSN National  stock  number P Park PARA Paragraph PMCS Preventive  maintenance  checks  and  services PN Part Number P/0 Part of PR Pair PRESS Pressure PSI Pounds  per  square  inch PSIG Pounds per square inch gage Q Quarterly Quality  Assurance QC Ouality  Control QA QT . Quart R Reverse REF Reference Glossary  2