Pyrography is the art of decorating wood or other materials with burn marks resulting from the controlled application of a heated object such as a poker. It is also known as pokerwork or wood burning. Native Americans called it writing with fire.
Woodburning with Orchid Davis by John C. Campbell Folk School, via Flickr
If It's Hip, It's Here: Burn Wood, Baby, Burn. The Incredible Pyrographic Art of Julie Bender.