| Meaning | Category |
| Handheld Personal Computer | Computing->General |
| Head Phone Clique | Internet->Chat |
| Hercules, Inc. | Business->NYSE Symbols |
| High - Performance Computing | Computing->Drivers |
| High Performance Chromatography | Miscellaneous |
| High Performance Club | Miscellaneous->Toastmasters |
| High Performance Coating | Business->Products |
| High Performance Computer | Business->International Business |
| High Performance Computing | Governmental->Military Computing->Networking |
| High Performance Cow | Miscellaneous->Funnies |
| High Productive Cutting | Business->General |
| Historical Piano Collection | Miscellaneous->Hobbies |
| Hydrological Processes And Climate | Academic & Science->Meteorology |
| Hydrometeorological Prediction Center | Academic & Science->Meteorology |
| The Human Preservation Council | Community->Non-Profit Organizations |
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