HAO
| Abbreviation | Meaning | Tamil Meaning | Category |
|---|---|---|---|
| HAO | High Altitude Observatory | - | Atmospheric Research Center |
| HAO | Hybrid Atomic Orbital | - | Computer Acronyms(common) |
| HAO | Hydrogenic Atomic Orbital | - | Computer Acronyms(common) |
| HAO | High Altitude Observatory | - | Business and Finance |