A commercial firm has named its product “Duck Tape,” harking back to the original name for an adhesive tape made of “duck” linen or cotton (a sort of a light canvas fabric).
It is now usually called “duct tape,” for its supposed use in connecting ventilation and other ducts (which match its current silver color). Note that modern building codes consider duct tape unsafe for sealing ducts, particularly those that convey hot air.
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