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| UNWCC | UNWFP | UNWRA | UNY | UNYU | UO |
| UO(s) | UOA | UOB | UOES | UOF | UOH |
| UOL | UOO | UOP | UOQ | UOR | UOS |
| UOT | UOTC | UOW | UP | UP&TT | UPA |
| UPAC | UPAL | UPAS | UPC | UPCC | UPD |
| UPDF | UPE | UPER | UPG | UPH | UPI |
| UPK | UPL | UPLC | UPLK | UPN | UPO |
| UPP | UPR | UPRD | UPRN | UPS | UPSC |
| UPT | UPTLM | UPU | UPV | UPW | UQC |
| UQF | UQI | UQJ | UQL | UQM | UQP |
| UQS | UQW | UR | UR(s) | URA | URAA |
| URAC | URAP | URC | URCS | URD | URDB |
| URE | URF | URG | URI | URIS | URISA |
| URK | URL | URM | URN | URO | URP |
| URPA | URPB | URPC | URPD | URPE | URPF |
| URPM | URPO | URPP | URPS | URPT | URPU |
| URPW | URPZ | URQ | URR | URR(s) | URS |