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| HSPI | HSQ | HSR | HSRP | HSRV | HSS |
| HSSI | HST | HST rotation | HSUS | HSV | HSV-2 |
| HSVI | HT | HTA | HTC | HTCS | HTD |
| HTF | HTG | HTH | HTLV | HTLV-I | HTLV III |
| HTM | HTN | HTO | HTP | HU | HUB |
| HUCSCR | HUGO | HUMS | HUS | HV | HVACC |
| HVC | HVD | HVE | HVI | HVK | HVLT-R |
| HVMS | HVPG | HVS | HW | HWBB | HWFL |
| HWGM | HWNC | HWP | HWRC | Hx | HYOCY |
| HYP | HYPO | hyst | HYT | HZV | I |
| I-131 | I&D | I&DeA | I&E | I&O | I/P |
| I-PWG | I/T | I-UAL | I/V | IA | IAAAM |
| IAADP | IAAR | IAAS | IABO | IABP | IAC |
| IACA | IACC | IACH | IACP | IACR | IACUC |
| IAD | IADAF | IADAM | IADL(s) | IADLS | IAE |
| IAEC | IAEP | IAFI | IAFWA | IAG | IAH |
| IAHA | IAHAIO | IAHS | IALT | IAMA | IAMS |