| Abbrev | Name | Spec | Type | Locality |
|---|---|---|---|---|
| ORZ | ORIZABA[114][144][1281]; | TR.AE | S | MEX |
| OS20 | OSJECKA-20[1281]; | TR.AE | W | YUG |
| OSCR | OSJECKA-CRVENKA[1281]; | TR.AE | W | YUG |
| OSK | OSJECANKA[1281]; | TR.AE | W | YUG |
| OSK2 | OSJECKA-2[133] | TR.AE | W | YUG |
| OSP,1 | OSPREY,MEX,TR.AE[114][144][1281] | TR.AE | S | MEX |
| OSP,2 | OSPREY,MEX,TR.DR[115][1281]; | TR.DR | S | MEX |
| OSTE | OSTRERO[115][1281]; | TR.DR | S | MEX |
| OVAI | OVACION-INIA[145][144][1281]; | TR.AE | S | CHL |
| OVI65 | OVIACHIC-65[115][1281]; | TR.DR | S | MEX |
| OVS | OVESON[740][1281]; | TR.AE | W | USA |
| OYCA | OYSTERCATCHER[115][1281]; | TR.DR | S | MEX |
| OZ368 | OUED-ZENATI-368[1281]; | TR.DR | S | DZA |
| P.G. | PONTA-GROSSA | TR.AE | ||
| P.N. | PROLIFIQUE-NAIN[39]; | FRA | ||
| P66.253 | PARANA-66.253 | TR.DR | S | BRA |
| P66.270 | PARANA-66.270 | TR.DR | S | BRA |
| PAB67 | PABELLON-67[115][1281]; | TR.DR | S | MEX |
| PAI | PROJECTO-ABAPO-IZOZOG | TR.AE | ||
| PAK81 | PAKISTAN-81[114][144][1281]; | TR.AE | S | PAK |