| O & M |
Operations and Management |
| O2 |
oxygen |
| O3 |
ozone |
| OAEs |
Own Account Enterprises |
| Obs |
Spot Observation spot. |
| Obsc |
obscured. |
| Obstr |
obstruction. |
| OC |
Overseas Chinese |
| Oc. |
occulting. |
| Oc.(2) |
group occulting. |
| Oc.(2+1) |
composite group occulting. |
| OCB |
Overseas Corporate Bodies |
| Occas |
occasional. |
| OCMS |
Online Complaint Management System |
| ODA |
Overseas Development Assistance |
| ODAS |
oceanographic data acquisition systems. |
| ODP |
ozone-depleting potential |
| ODS |
ozone-depleting substances |
| OECD |
Organisation for Economic Cooperation and Development |
| OFW |
Overseas Filipino Workers |
| OGJ |
The oil and gas journal |
| OKF |
Overseas Koreans Foundation |
| OL |
Outstanding Loan |
| OM |
Office Memorandum |
| OMB |
Open Market Borrowing |
| ONGC |
Oil & Natural Gas Corporation |
| Or |
orange. |
| OROF |
Omnibus Rules on Overseas Filipinos |
| OSPAR |
joint Oslo and Paris Commissions — North Sea |
| OTC |
officer in tactical command. |
| OTSR |
Optimum Track Ship Routing. |
| OVOS |
assessment of ecological impacts |
| OWWA |
Overseas Workers Welfare Administration. |
