Tablet

A tablet was a portable computer with a touch screen used on 21st century Earth. Miss Kizlet used a tablet to control the minds of people in the Shard. (TV: The Bells of Saint John)

Later on in history, TG tablets replaced the 21st century variety, operating mostly on thought. (AUDIO: A Death in the Family)

Missy had a tablet which she looked at Clara with, and presumably could look at anyone else with. (TV: Flatline)