Rank | Abbreviation | Meaning |
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***** | HACO | High Altitude Cerebral Oedema
| |
***** | HACO | Hertfordshire Association of Cultural Officers
| |
**** | HACO | Human Action Community Organization
| |
**** | HACO | Human Adaptation and Countermeasures Office
| |
**** | HACO | Herts Association of Cultural Officers
| |
**** | HACO | Humanitarian Assistance Co Ordinator
| |
**** | HACO | Harambee Afrikan Cultural Organization
| |
**** | HACO | Health Action Charity Organisation
| |
**** | HACO | Humanitarian Assistance Coordination Office
| |
**** | HACO | Healthy Active Central Oregon
| |
*** | HACO | HUNTER AIRCRAFT CORP.
| |