duct tape

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A usually silver adhesive tape made of cloth mesh coated with a waterproof material, originally designed for sealing heating and air-conditioning ducts.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A generally gray waterproof tape used for many purposes, and possessing nearly mythic status in American culture. It is no longer used for constructing duct-work, as building codes require more advanced products.
• verb transitive To use duct tape in order to tape one object to another.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a wide silvery adhesive tape intended to seal joints in sheet metal duct work but having many other uses