Leading seaman

Common military ranks in English
Navies	Armies	Air forces
Commissioned and Non-commissioned officers
Admiral of the fleet	Marshal or Field marshal	Marshal of the air force
Admiral	General	Air chief marshal
Vice admiral	Lieutenant general	Air marshal
Rear admiral	Major general	Air vice-marshal
Commodore	Brigadier or Brigadier general	Air commodore
Captain	Colonel	Group captain
Commander	Lieutenant colonel	Wing commander
Lieutenant commander	Major or Commandant	Squadron leader
Lieutenant	Captain	Flight lieutenant
Sub-lieutenant	Lieutenant or First lieutenant	Flying officer
Ensign	Second lieutenant	Pilot officer
Midshipman	Officer cadet	Flight cadet
Enlisted grades
Warrant officer or Chief petty officer	Warrant officer or Sergeant major	Warrant officer
Petty officer	Sergeant	Sergeant
Leading seaman	Corporal	Corporal
Seaman	Private	Aircraftman

Leading Seaman is a junior non-commissioned rank or rate in navies, particularly those of the Commonwealth. When it is used by NATO nations, Leading Seaman has the rank code of OR-4. It is often equivalent to the army and air force rank of corporal and some navies use Corporal rather than Leading Seaman.

The rank is used in the navies of Australia, Bangladesh, Canada, Finland, Ghana, India, Ireland, Namibia, New Zealand, Norway, Pakistan, South Africa, Sri Lanka and the United Kingdom.

The badge in the Royal Australian Navy is the fouled anchor over the word "Australia", worn on 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 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 (which is actually an appointment of leading seaman). Its Army and Air Force equivalent is corporal and it is part of the cadre of junior non-commissioned officers.

...
Wikipedia