| Meaning | Category |
| Big Spring, Texas USA | Regional->Airport Codes |
| Handicap Children's Association | Community->Non-Profit Organizations |
| Hardware Configuration Audit | Governmental->Military Governmental->NASA Governmental->US Government |
| Hawaii Conservation Alliance | Community->Non-Profit Organizations |
| Head of Contracting Activity | Academic & Science->Ocean Science |
| Healthcare Certification Authority | Medical->Hospitals |
| HeteroCyclic Amine | Academic & Science->Chemistry |
| High Current Amplifier | Academic & Science->Amateur Radio |
| High capacity Air Ambulance | Governmental->Military |
| Hill Climb Assist | Community->Sports |
| Holiday Camp Association | Community->Non-Profit Organizations |
| Hospital Corporation Of America | Business->Firms |
| Host Channel Adapter | Computing->Hardware |
| Humanitarian and Civic Assistance | Governmental->Military |
| Hydroxy Citric Acid | Academic & Science->Chemistry |
| State Health Care Authority (Washington) | Community->Law |
| The High Court Of Australia | Community->Law |
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