A fid in use aboard the USS John C. Stennis.
Source: http://en.wiktionary.org/wiki/File:US_Navy_060614-N-2659P-025_Seaman_Jamie_Lewis_uses_a_fid_to_repair_a_snag_on_a_mooring_line_aboard_Nimitz-class_aircraft_carrier_USS_John_C._Stennis_(CVN_74).jpg