Barnacle (slang) in the field in order to correct a design or manufacturing defect. The term appears to have originated from the crustacean barnacle which is an animal that attaches itself to rocks, docks, ships, whales, and other objects where it grows. A barnacle in electronics is something added to the manufactured product. Typically a barnacle on a circuit board is very noticeable, much like the mollusc variety on a rock in the sea. While the term was originally used with electronic hardware, it has also migrated into the software industry where is it is used to describe software that is added
Ivory barnacle but that species is smaller, only growing to a height of . Another similar species is the striped barnacle ("Balanus amphitrite") but that has vertical pink lines on the test. The native range of the ivory barnacle extends from Nova Scotia to the Caribbean Sea and Gulf of Mexico but it has extended this range as a result of fouling the bottoms of ships and because its larvae are sometimes transported in ballast water. It was first seen in Pearl Harbor, Hawaii in 1929 and is now common in all the main islands. It is found, sometimes in great numbers,