HCO
From Wikipedia, the free encyclopedia
HCO may stand for:
- Harvard College Observatory, an astronomical research organization
- Hearing-Carry-Over, a type of Telecommunications Relay Service
- Hubbard Communications Office, an organization in the Church of Scientology, formerly located at Saint Hill, best known for issuing policy letters (e.g., Fair Game)
- Bicarbonate Hydrogen carbonate AKA: Bicarbonate
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