Thumb keyboard

File:HTC Apache.jpg

A thumb keyboard, or a thumb board, is a type of keyboard commonly found on PDAs, mobile phones, and PDA phones which has a familiar layout to an ordinary keyboard, such as QWERTY.{{Cite book |last1=Siewiorek |first1=Dan |url=https://books.google.com/books?id=N4ByEAAAQBAJ&dq=Thumb+keyboard+QWERTY&pg=PA28 |title=Application Design for Wearable Computing |last2=Smailagic |first2=Asim |last3=Starner |first3=Thad |date=2022-06-01 |publisher=Springer Nature |isbn=978-3-031-02476-4 |language=en}} The inputting surface is usually relatively small and is intended for typing using the available thumbs, while holding the device.{{Cite book |last1=Sears |first1=Andrew |url=https://books.google.com/books?id=npLEMUzgQ_0C&dq=Thumb+keyboard+QWERTY&pg=PA144 |title=Human-Computer Interaction Fundamentals |last2=Jacko |first2=Julie A. |date=2009-03-02 |publisher=CRC Press |isbn=978-1-4200-8882-3 |language=en}}