- OCG
- Oral CholecystoGram (Medical » Physiology)*** Original Card Game (Miscellaneous » Hobbies)* Orange County Guild (Community » Non-Profit Organizations)* Old Chinese Guy (Miscellaneous » Funnies)* Oktibbeha County Hospital (Medical » Hospitals)* Outdoor Classroom Garden (Community » Educational)* Occupational Classifications Guide (Business » Positions)* Occupational Classifications Guide (Governmental » US Government)
Abbreviations dictionary. 2012.