Comment 14 for bug 382626

A few suggestions :

1°) why not a "T" icon, like these usually find to express something related to font stuff ?
(something like http://images1.wikia.nocookie.net/wowwiki/images/thumb/e/e0/Icon-font.svg/120px-Icon-font.svg.png )
2°) considering that the function is close to a CLI/GUI choice, maybe a prompt icon without the black screen ( http://gigapple.files.wordpress.com/2009/03/terminal_icon.png?w=240&h=240 )
3°) maybe a mix of both
4°) since text mode can be seen like an advanced user feature, the icon usually used for advanced options could fit 5°) something related to a keyboard icon or a few keys ( http://icons.iconseeker.com/png/fullsize/tulliana-2/keyboard-layout-3.png )

Personally i like 2°) & 3°)