Tabi Tabi In contrast to socks that, when pulled on, fit the foot snugly because of their elastic weave, tabi are sewn from cloth cut to form. They are open at the back so they can be slipped on and have a row of fasteners along the opening so they can be closed. Construction workers, farmers and gardeners, rickshaw-pullers, and other workmen often wear a type of tabi called . Made of heavier, tougher material and often having rubber soles, jika-tabi resemble boots and are outer footwear rather than socks. Like other tabi, jika-tabi are toe-divided so they can be worn
Supernumerary body part considered to have lost much or all of their original function through evolution. These body parts can be classed as additional to the required functioning of the body. In human anatomy the vermiform appendix is sometimes classed as a vestigial remnant. Prosthesis is an artificial extension that replaces a body part, and cybernetics is the study of computer technology in relation to organisms which can include replacement or additional body parts. Body integrity identity disorder (BIID) is a psychiatric disorder in which a person thinks that they have one or more additional limbs than they should, despite having two arms