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A fathom is a unit of length in the Imperial system (and the derived U.S. customary units). The name derives from the Old English word fæðm meaning 'outstretched arms'.[1][2][3] In Middle English it was fathme. Its size can vary from system to system. The most commonly used fathom today is the international fathom. There are 2 yards (6 feet) in a fathom.[4]