CROSSBONES n.
A representation of two of the leg bones or arm bones of a skeleton, laid crosswise, often surmounted with a skull, and serving as a symbol of death. Crossbones, scythes, hourglasses, and other lugubrios emblems of mortality. Hawthorne.
NAPIER'S BONES; NAPIER'S RODS n.
A set of rods, made of bone or other material, each divided into nine spaces, and containing the numbers of a column of the multiplication table; -- a contrivance of Baron Napier, the inventor of logarithms, for facilitating the operations of multiplication and division.