Frank Haven Hall was an American inventor and essayist who is credited with inventing the Hall braille writer and the stereographer machine. He also invented the first successful mechanical point writer and developed major functions of modern day typography with kerning and tracking.

A keyset or chorded keyboard is a computer input device that allows the user to enter characters or commands formed by pressing several keys together, like playing a "chord" on a piano. The large number of combinations available from a small number of keys allows text or commands to be entered with one hand, leaving the other hand free. A secondary advantage is that it can be built into a device that is too small to contain a normal-sized keyboard.