1test of possible UTF-8 glyphs usable to notify T9 mode like is done on phones (usually "123", "abc", "Abc", "ABC", and the same with some dots on the left implying speed for dictionary modes).
2It's probably simpler to use icons anyway.
3//Abc
4≡Abc
5≫Abc
6≒Abc
7∴Abc
8∵Abc
9∷Abc
10���Abc
11���Abc
12⺀Abc
13〃Abc
14≈Abc
15=Abc
16#Abc
17"Abc
18'Abc
19*Abc
20µAbc
21.:Abc
22¨Abc
23