the.com/claw hammer

Half the tool drives nails in, half admits you were wrong.

means A hammer with a flat striking face on one side and a curved, split claw on the other for pulling nails back out.

from Straightforward compound of 'claw' (the forked, nail-gripping V) and 'hammer' (from Old English hamor, itself from a Germanic root meaning stone tool — hammers started life as literal rocks). The claw design itself dates back centuries, a simple answer to an obvious problem: whatever drives a nail in should probably also be able to drag one back out.

name origin
curved claw pulls nails, no relation to actual claws
curve geometry
true curve gives better leverage than framing hammers
banjo style
also names a percussive thumb-and-finger picking technique
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