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| OTIS | OTL | OTM | OTO | OTP | OTPROM |
| OTR | OTS | OTSR | OTSS | OTT | OTTFF |
| OTU | OU | OUA | OUAT | OUC | OUCH |
| OUE | OUF | OUGS | OUHSC | OUJ | OUL |
| OUM | OUN | OUQ | OUR | OUS | OUSA |
| OUV | OUZ | OV | OVA | OVAL | OVB |
| OVC | OVCO | OVCST | OVD | OVG | OVI |
| OVL | OVM | OVN | OVP | OVPQ | OVQ |
| OVSP | OVZ | OW | OWB | OWC | OWCC |
| OWD | OWF | OWL | OWLS | OWP | OWQP |
| OWR | OWS | OWSE | OWST | OWU | OWW |
| OX | OXA | OXC | OXD | OXL | OXM |
| OXN | Oxon | OXS | OXT | OXWASP | OXY |
| OXY- WATER | OY | OYA | OYO | OYR | OZ |
| OZCHI | OZG | OZM | OZR | OZT | OZW |
| P?? | P/A | P(E) | P-G | P-GILD | P&ID |
| P(J) | P-M | P-P | P&S | P02 | P2O |