| Abbreviation | Definition |
|---|---|
| HOURS | The time period when 60 minutes or more has occurred. |
| HP | Half Pint |
| HP | Horse Power |
| HP | HorsePower |
| hPa | Hectopascal |
| HPI | Holes Per Inch |
| HPL | Hours Per Level |
| HPS | Hits Per Second |
| HPW | Hours Per Week |
| HR | Hour |
| hr(s) | hour(s) |
| hr. | hour |
| HRS | Hours |
| HS | Hour of Sleep |
| ht. | height |
| HU | Hazen Units |
| HU | Heat Units |
| HU | Hidden Units |
| HU | Hospital Unit |
| HU | Hounsfield Units |