| Abbreviation | Definition |
|---|---|
| UBTX | Union Camp Corporation |
| UCAU | UCA Containers AG |
| UCCU | American Cyanamid |
| UCCX | Union Carbide Canada |
| UCCX | Union Carbide Canada Limited |
| UCEX | Union Electric |
| UCEX | Union Electric Company |
| UCFX | Union Carbide Corporation |
| UCIR | Union County Industrial Railroad |
| UCLU | Unicorn Lines |
| UCLU | Unicorn Lines (Pty) Limited |
| UCLX | Vulcan Materials Co ChemicalsDiv |
| UCLX | Vulcan Minerals |
| UCMX | United Clays |
| UCMX | United Clays Incorporated |
| UCOX | Praxair Incorporated |
| UCOX | Union Carbide Corporation |
| UCPX | Essem Corporation |
| UCR | Utah Coal Route |
| UCRY | Utah Central Railroad |