O

OA

OBF Fluids

Object

Object Standard

Objective

Objective Evidence

Objective-based Cut Score

Obligated Party

OBM

OBP

Observation

Observation Period

Observation Well

Observation Wells

Observer

OBSROV

Obstacle

Obstacle-free Sector

Occupation

Occupational Diving

Occupational Exposure Limit

Occupational Health and Safety

Occupational Illness

Occupational Injuries

Occupational Injury

Occupied

Occupied Dwelling

Oceanographer

Oceanographic Contractor

Oceanographic Observing