CCO

Catalogue of Cometary Orbits
Found on http://www.translationdirectory.com/glossaries/glossary142.htm

CCO

Central Compact Object, a compact star in the center of a planetary nebulae
Found on http://www.translationdirectory.com/glossaries/glossary142.htm

CCO

Cancer Care Ontario
Found on http://www.encyclo.co.uk/local/20895

CCO

Converter Clutch Override
Found on http://www3.sympatico.ca/dhaughey/j1930.htm

CCO

Civilian Communication Officers
Found on https://www.encyclo.co.uk/local/21417

CCO

Close Combat Optic
Found on http://www.translationdirectory.com/glossaries/glossary262.php
No exact match found