stylus

noun (plural styli /-ˌlī/ or styluses)

• 1a hard point, typically of diamond or sapphire, following a groove in a phonograph record and transmitting the recorded sound for reproduction.
• a pointed device formerly used to produce a groove in a record when recording sound.

• 2an ancient writing implement, consisting of a small rod with a pointed end for scratching letters on wax-covered tablets, and a blunt end for obliterating them.
• an implement with a pointed end used especially for engraving and tracing.
• Computing a penlike device used to input handwritten text or drawings directly into a computer or for input on a touch-sensitive monitor.