Carbon

1. A nonmetallic chiefly tetravalent element found native (as in diamond and graphite) or as a constituent of coal, petroleum, and asphalt, of limestone and other carbonates, and of organic compounds or obtained artificially in varying degrees of purity especially as carbon black, lampblack, activated carbon, charcoal, and coke
3. A carbon rod used in an arc lamp
3. A sheet of carbon paper