In past at 2007 on Windows Mobile there was project
Pocket UFO (last version is 1.26)
That was clone of UFO: EU, with some good features.
One of the features was classes which describes soldiers regard their stats.
Main classes were:
sniper / psi / gunman
But game not used only 1 icon, game used 2 icons for description of the classes:
sniper + sniper
sniper + psi
psi + psi
psi + gun
gun+gun
And here is how that was look like (in that exapmple psi+psi):
Maybe it is better use these icons instead of "/Snpr", "/w" etc?