The scalloped hammerhead ("Sphyrna lewini"), also known as the bronze hammerhead, the kidney-headed hammerhead, or the southern hammerhead, is a species of hammerhead shark. It was first known as "zygaena lewini", but is now known as "Sphyrna lewini". The word "Sphyrna" is a Greek word meaning "hammer", which refers to the "hammer" or "cephalofoil" on its head.