Abbr.

Description

U/W

Underwriter

UC

Usual Conditions.

UD.

Under Deck

UDK.

Upper Deck

ULCC

Ultra Large Crude Carriers.

UN NO

UN Number-A Four-digit Number Given by U.N.Committee of Dangerous Goods Transport to Identify a Substance or a Group of Substances.

UNCON

Uncontainerable Goods.

UNCTAD

United Naions Conference on Trade and Development.