| H+ | hydrogen ion |
|---|---|
| [H+] | hydrogen ion concentration |
| HCl | hydrogen chloride |
| HDP | hexose diphosphate; high-density polyethylene; hydrogen diphosphonate; hydroxydimethylpyrimidine |
| HF | Hageman factor; haplotype frequency; hard filled [capsule]; hay fever; head of fetus; head forward; ... |