| Full Form | Category | Term |
|---|---|---|
| Head quarters/high official Quota | Indian Railways | HO |
| Hand Off | Computer and Networking | HO |
| Host Open | Networking | HO |
| Holmium | Chemistry | Ho |
| High Output | Electronics | HO |
| Head Office | Banking | HO |
| Hold On | Messaging | HO |
| Hydrogen-oxygen | Space Science | HO |
| Harmonic Oscillator | Radio Science | HO |
| Higher Order | Maths | HO |
| High Order | Physics Related | HO |
| Humanitarian Offensive | Military and Defence | HO |
| Humanitarian Operation | Military and Defence | HO |
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