What rank in the Navy comes between Ordinary Seaman and Leading Seaman
Able seaman was originally entered using the abbreviation "AB" instead of the more obvious "AS" in ships' muster books or articles. Such an entry was likely to avoid confusion with ordinary seaman ("OS"). Later the abbreviation began to be written as "A.B.", leading to the folk-etymological "able-bodied seaman". The "correct" term, "able seaman," remains in use in legal documents, in seaman's papers, and aboard ship. Able seaman An able seaman (AB) is a naval rating of the deck department of a merchant ship with more than two years' experience at sea and considered "well acquainted with his duty". An AB may work
Leading seaman the shoulders, or the fouled anchor worn on the left sleeve, depending on what uniform is worn at the time. It is senior to able seaman but junior to petty officer. Leading seaman or leading hand, which it is also known as, is the equivalent of corporal in the Royal Australian Air Force and the Australian Army. Leading seamen are addressed as "leader", and informally known as "killicks" from the killick anchor which is the symbol of their rank. In the Royal Canadian Navy, leading seaman (LS) is senior to the rank of able seaman, and junior to master seaman