Chinese Abacus. The abacus is first known in China from the Northern Song dynasty through the work of Shao Yong (1011-1077). Like many early inventions it is not clear precisely where it originally came from. Some say Central Asia; some Asia Minor and others China.
Snag(noun) a stump or base of a branch that has been lopped off; a short branch, or a sharp or rough branch; a knot; a protuberance. Snag(noun) a tooth projecting beyond the rest; contemptuously, a broken or decayed tooth.
a device, often consisting of a noose, for capturing small game. 2. anything serving to entrap or entangle unawares; trap. 3. Surgery. a wire noose for removing tumors or the like by the roots or at the base. verb (used with object), snared, snaring. 4. to catch with a snare; entangle.