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| OECC | OECI | OED | OEG | OEI | OER |
| OES | OF | OFA | OFC | OFD | OFFA |
| OFI | OFS | OGD | OGT | OGTT | OH |
| OHA | OHB | OHCAP | OHD | OHE | OHER |
| OHI | OHIP | OHL | OHM | OHN | OHP |
| OHRR | OHRU | OHS | OHSS | OHU | OHZ |
| OI | OIAP | OICAN | OICU | OID | OIE |
| OIN | OIS | OJ | OJEU | OJP | OJW |
| OK | OKC | OKG | OKN | OKS | OLM |
| OLRT | OLT | OLTCA | OM | OMAFRA | OMB |
| OMC | OMD | OMD/DOM | OME | OMEF | OMFS |
| OMFU | OMH | OMHO | OMIM | OMJ | OMM |
| OMMA | OMNI | OMNI XX | OMP | OMRF | OMSCO |
| OMSH-N | OMT | OMZ | ON | ONB | ONC |
| ONDCP | ONH | ONJ | ONS | ONS format XX | ONSD |
| ONT | ONTO | OOB | OOE | OOH | OOM |
| OOP | OOPC | OOPD | OOPE | OOPR | OOPT |