| Abbreviation | Definition |
|---|---|
| HC | Hourly Count |
| HCF | Hundred Cubic Feet |
| HD | Hundred Dollars |
| HD | Hundreds of Dollars |
| HDD | Heating Degree Days |
| HDOP | Higher Division Of Precision |
| HDPI | High Dots Per Inch |
| HETAP | High Efficiency Trail Assessment Process |
| HEX | HEXadecimal |
| HG | Half Gram |
| hgt. | height |
| HHMMSS | Hour, Minute, Second |
| HJD | Heliocentric Julian Date |
| hm | hectometer |
| hm | hectometre |
| HM | HektoMetre |
| HMS | Hours Minutes Seconds |
| HMSZ | Hours, Minutes, Seconds, Zone |
| HOOK | Helping Out Our Kids |
| HOQ | Heraeus Optical Quality |