| Abbreviation | Definition |
|---|---|
| HRT | Higher Rank Tensor |
| HS | Hilbert Schmidt |
| HS | Hodge Structure |
| HS | Horizontal Space |
| HSF | Height Sampling Fraction |
| HSI | Horizontal Sampling Interval |
| HSMC | High School Math Competition |
| HSMC | High School Mathematics Competition |
| HT | Hypothesis Test |
| HTMC | High-Throughput Monte-Carlo |
| HTS | Hausdroff Topological Space |
| HV | HyperVariable |
| HVDM | Heterogeneous Value Difference Metric |
| HVF | High Value First |
| HVL | Homogenous Value List |
| HVT | Hoeffding Vapnik Talagrand |
| I | Inclusive |
| I | Inverted |
| I | Roman numeral 1 |
| IA | Improbable or Absurd |