ASETNIOP is a keyboard replacement method that provides the full functionality of an entire keyboard using only ten keys. In ASETNIOP, the most common letter pressed by each finger on a traditional QWERTY keyboard (A, S, E, T, N, I, O, and P) is assigned to each of the eight “home” keys. The shift and space keys are assigned to the thumbs. All other letters in the alphabet, as well as punctuation, numbers, symbols, and other function keys, are produced by pressing “chords” of two or more keys at once.
(via http://asetniop.com/ )