Pen - pen and ink
A tool used for writing or drawing in ink and the description of that process. The earliest pens were made from reeds and quills of feathers, and some drawing specialists still use these items. However most use manufactured pens such as Ballpoint Pens, Drawing Pens, Felt Markers, Fountain Pens and Ruling Pens. A drawing described as having the mediums of Pen and Ink is one that is created with a pen dipped in ink. Source: Kimberley Reynolds & Richard Seddon, "Illustrated Dictionary of Art Terms"