Scrimshaw is the name given to handiwork created by whalers made from the byproducts of harvesting marine mammals.  It is most commonly made out of the bones and teeth of Sperm Whales, the baleen of other whales, and the tusks of walruses.  It takes the form of elaborate carvings in the form of pictures and lettering on the surface of the bone or tooth, with the engravings highlighted using a pigment, or small sculptures made from the same material.

While scrimshaw is rarely done on whale bone these days, the art is
still practiced by a few artists. Common modern materials would
be ivory, micarta and camel bone. Modern scrimshaw typically
retains the nautical themes of historical scrimshaw, but can also
go well outside of the traditional.