the.com/hammerhead shark

means A shark with a flattened, mallet-shaped head (called a cephalofoil) and eyes set at its outer edges, giving it wide-angle vision and heightened electrosensory ability for hunting.

from Straightforward English compound — 'hammer' plus 'head,' describing exactly what early observers saw: a shark whose skull is stretched sideways into a broad, blunt-edged shape like a hammer or mallet. No myth-making needed here; the name is purely descriptive, dating from when naturalists first catalogued the fish by its most obvious feature. The scientific family name Sphyrnidae comes from the Greek 'sphyra,' meaning hammer — the same plain observation, just dressed in Greek.