De link :
A keyboard with few keys is called a keypad.
link :
A keypad is a set of buttons arranged in a block or "pad" which usually bear digits, symbols and usually a complete set of alphabetical letters. If it mostly contains numbers then it can also be called a numeric keypad.
Se você tem mais algumas chaves, pode chamar de 40% :
40% – Extremely small form factor with only the bare minimal of dedicated keys required to function. No alphanumeric keys, F-row or numpad. Many standard key operations will be hidden under multiple function layers. Some keys will be of a non-standard size.
Ou, alternativamente, você pode chamar de Apple Keyboard 2018 .
Exemplo :