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The word barnacle is a slang term used in electrical engineering to indicate a change made to a product on the manufacturing floor that was not part of the original product design. A barnacle is typically used to correct a defect in the product or as a way of enhancing the product with new functionality. A barnacle is normally a quick fix that is used until the product design can be redone incorporating the barnacle into the actual product so that when manufactured, the barnacle step in manufacturing is no longer required. A barnacle may also be added in the field in order to correct a design or manufacturing defect.