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| UNP | UNPA | UNQ | UNRC | UNS | UNSITRAGUA |
| UNT | UNW | UNX | UO | UOA | UOAI |
| UOB | UOC | UOC-MP | UOC-USA | UOCUS | UOD |
| UOE | UOF | UOI | UOJ | UOM | UOR |
| UOS | UOT | UOU | UOV | UP | UPA |
| UPAC | UPACP | UPC | UPCC | UPCI | UPCS |
| UPD | UPE | UPEC | UPER | UPF | UPG |
| UPI | UPK | UPL | UPLF | UPMS | UPN |
| UPO | UPP | UPPSC | UPR | UPRD | UPS |
| UPSB | UPTO | UPV | UPW | UPY | UPZ |
| UQ | UQC | UQE | UQI | UQK | UQS |
| UQW | UQW-477 | UR | URA | URAC | URB |
| URC | URD | URDS | URE | UREA | URESA |
| URF | URFA | URG | URH | URJ | URL |
| URM | URN | URNZ | URO | UROK | URP |
| URPA | URPC | URPD | URPI | URPK | URPS |
| URPT | URPW | URR | URS | URT | URTNA |