| Abbreviation | Definition |
|---|---|
| HDT | Higher Degree Term |
| HEF | Hyper Elliptic Function |
| HEG | Hyper Exponential Group |
| HEX | HEXagon |
| HFE | Hidden Field Equations |
| HH | Horizontally Homogeneous |
| HHH | Head Head Head |
| HIF | Horizontal Internetwork Fields |
| HIFI | Hierarchical Interactive Flowgraph Integration |
| HIPO | Hierarchical Input Process Output |
| HL | Hectoliter |
| HLAR | High Level Algorithm Recognizer |
| HLBN | High Level Bellman Net |
| HLBP | Hybrid Loopy Belief Propagation |
| HLBT | Hierarchical Lapped Bior-Thogonal |
| HLCY | Helicity |
| HLD | Huang Lyuu Dai lattice algorithm |
| HLGOF | Hosmer-Lemeshow Goodness-of-Fit |
| HLM | Hierarchical Linear Model |
| HLMA | Hang Lung Mathematics Awards |