| ACRONYM | FULL WORDING | COMMENT |
| ULCC | Ultra Large Crude Carrier | Tanker above 300.000 T DW |
| USB | Unless Sooner Berthed | Used about the freetime allowed to the Charterers after receipt of the NOR which ceases when the vessel berthes. |
| USD | US Dollar | |
| UTC | Universal Time | Modern way to say " GMT " |
| UU | Unless Used | Used about time normally excepted from laytime which shall count when used. It requires to be clarified by a statement that only the time effectively used thall count - in full or for half, as agreed |
