The grilled opening into a room by which the amount of warm air from a furnace can be directed or controlled; may include a damper.

An unpreventable and unpredictable event which could cause loss or damage to buildings, land,.

Zinc oxide: the powdery product of corrosion of zinc or zinc-coated surfaces.

A type of heating fuel derived by refining crude oil that has a boiling range at atmospheric pressure from 400 degrees to 550 degrees F.

Lower explosive limit (lower flammable limit)

Intermediate Fuel Oil

A linear imperfection in a crystalline array of atoms. Two basic types are recognized: (1) an edge dislocation corresponds to the row of mismatched atoms along the edge formed by an extra, partial plane of atoms within the body of a crystal; (2) a screw d ...

World Customs Organization (Ex Customs Cooperation Council)

Women's International Shipping and Trading Association

European Maritime Pilots Association

Ad valorem.

Automated Weather Observing Station. A self-contained weather station designed to make aviation weather observations without operator involvement.

Persian Gulf (See AG)

The frequency of a carrier wave.

Universal Resource Locator

A process for carrying out a reaction in which the reactants are fed in discrete and successive charges.

General Agreement On Tariffs and Trade 1994 (now WTO)

Working Paper

Wire Rods in Coils

Special Drawing Rights