An optical pen is a device that is used to capture handwriting or drawings. It is also known as a digital pen, electronic pen, or smart pen. These pens are designed to mimic the feel of a regular pen or pencil, but they come with added functionalities. They allow for the digitization of notes and sketches, and some even have artificial intelligence capabilities. Other synonyms for optical pen include digital stylus, electronic pencil, smart marker, smart stylus, and interactive pen. These pens are becoming increasingly popular in the digital age, as they provide a way to bridge the gap between the analog and digital worlds.