20-Key Keyboard (Half-QWERTY)

A layout for text keyboards that's designed to be more compact that traditional QWERTY, to fit onto smaller devices. A 20-key layout puts letters in the same basic arrangement as QWERTY, but has two letters per key.

20-Key Keyboard

Predictive text software is almost always employed to allow users to only press each key once, intelligently guessing which letter the user intended to type.

A 20-key layout is narrower than full QWERTY, allowing it to be used one-handed, and allowing it to fit at the bottom of a device held vertically (portrait orientation.)

Sharing is happiness: