In Gnome 3 on the top right corner I have this universal access icon with all these options which I am not intending to use in the meanwhile. How can I disable/hide the useless for me icon there?
Edit the file
Comment out this line like so:
There is an extension for that called GNOME Shell noa11y, which removes the Accessibility icon from the GNOME Shell system status area.
more information here.
In 3.5 and I believe 3.4 the function was moved to
if you comment out line 11
it will disable calling the accessibility icon
I also posted a solution at Gnome Shell Remove Accessibility Icon
Easy, Click the control Cog at the top right (the one to the right of your name>) Second click System Settings, from there select Universal Access, then select typing and UNSELECT "turn on accessibility features from the keyboard."
The icon should instantly disappear. HOWEVER you may need to reboot.
Not a real solution, but notable: There is bug #640190 in the gnome bug tracker which requested this ability. Unfortunately, it has been closed as WONTFIX.
For 3.6 there is no solution at the moment. See https://github.com/ecoleman/noa11y-colemando.com/issues/7
For GNOME 3.6 there is an extension at https://extensions.gnome.org/extension/112/remove-accesibility/ that solves the problem. It worked for me in Ubuntu 12.10.