The acronym T9 stands for Text on 9 keys. T9 "predictive texting" is a tool used primarily on non-smartphones (those with just a nine-key keyboard similar to a telephone) to allow users to text ...

Predictive Text Entry, (also know by the most popular type, T9,) allows you to enter text by pressing only one key per letter on a keypad where multiple letters share keys. As you enter a word ...

T9 was the first predictive text technology to ... of keypresses required for typing on multi-press keypads by matching key sequences to a dictionary of the possible words. It prioritizes words ...