| Abbreviation | Name | Used For |
|---|
| % | percent | Ratios |
| ℓ | Liters | Volume |
| (count) | Count | Counting quantities such as inventory amounts, etc. |
| a* | Red (+) & d Green (-) Compared to a Std | Measuring Reflected Llight |
| amp | Ampere | Electrical current |
| b* | Yellow (+) & Red (-) Compared to Std | Reflected Light Color Coordinate System |
| bar | Bars | Pressure |
| BTU | British Thermal Units | Energy |
| BTU/hr | British Thermal Units per hour | Power |
| BTU/min | British Thermal Units per minute | Power |
| BTU/sec | British Thermal Units per second | Power |
| CFH | Cubic Feet Per Hour | Air Flow |
| CFM | Cubic Feet per Minute | volume flow rate |
| cm | Centimeters | Length |
| dB | Decibel | Sound intensity |
| deg | Degrees (Angular) | Angles |
| deg-C | Degrees Celsius | Temperature |
| deg-F | Degrees Farenheight | Temperature |
| EA | Each | |
| F | Farads | Capacitance |
| FPI | Fins Per Inch | Count |
| ft | Feet | Length |
| ft-lb | Foot pounds | Torque |
| ft/min | Feet per Minute | Velocity |
| ft/sec | Feet per second | Velocity |
| ft/sec² | Feet per second squared | Acceleration |
| g | Grams | Weight |
| gm/sq. ft. | Oil weight | Oil weight |
| GPM | Gallons Per Minute | Volumetric flow rate |
| GU | Gloss Units | Paint Gloss |
| hr | Hours | Time |
| in | Inches | Length |
| in-lb | Inch Pounds | Torque |
| in/sec | Inches per second | Velocity |
| in² | Square inches | Area |
| in³ | Cubic inches | Volume |
| joule | Joules | Energy |
| joule/hr | Joules per hour | Power |
| joule/min | Joules per minute | Power |
| joule/sec | Joules per second | Power |
| kg | Kilograms | Force or weight |
| km | Kilometers | Length |
| KSI | Kilopounds per Square Inch | Stress |
| L* | CIELAB Units | Reflected Light Color Coordinate System |
| L*a*b* | CIELAB | Reflected Light (Color) |
| lb | Pounds | Force or weight |
| lb/ft | Pound Per Foot | Weight |
| m | Meters | Length |
| mℓ | Milliliters | Volume |
| m/sec² | Meters per second squared | Acceleration |
| ma | milliamps | Current |
| mg | Milligrams | Weight |
| mg/in² | Milligrams per square inch | Weight distributed over an area |
| mg/mm² | Milligrams per square millimeter | Weight distributed over an area |
| mil | Mils | Length |
| mil/sec | Mils per second | Velocity |
| miles | Miles | Length |
| min | Minutes | Time |
| ml | Concentration | Volume |
| ml/min | Millimeters per minute | Concentration flow rate |
| mm | Millimeters | Length |
| mm² | Square millimeters | Area |
| mm³ | Cubic millimeters | Volume |
| MPa | Mega Pascals | Pressure measurement |
| MPH | Miles per hour | Velocity |
| mS | Microsiemens | Conductivity |
| mTorr | Millitorrs | Pressure |
| N | Newtons | Force |
| n/a | Defrost Control | Assy, Control Panel |
| nF | Nanofarads | Capacitance |
| Nm | Newton meters | Energy or torque |
| Nm/hr | Newton meters per hour | Power |
| ohm | Ohms | Electrical resistance |
| oz | Ounces | Volume |
| pascal | Pascals | Pressure |
| pF | Picofarads | Capacitance |
| pH | Chemistry of water | Acidity of water |
| PPM | Parts Per Million by Weight | Weight |
| PSI | Pounds per Square Inch | Pressure |
| qty | double loop tie wrap | prevent wires touching tube |
| RPM | Revolutions Per Minute | Fan motor |
| sec | Seconds | Time |
| SPM | Stroke Per Minute | Energy distributed over time |
| Text | Text | Address on Heat Kit labels |
| Torr | Torrs | Pressure |
| V | Volts | Potential difference |
| W | Watts | Power |
| µF | Microfarads | Capacitance |
| µm Hg | Microns | Vacuum Level |