How do you make the icons like in David's bio?
<kbd>![RMB][RMB] RMB</kbd> [RMB]: http://i.stack.imgur.com/LPwD4.png (Right Mouse Button)
The mouse icon is simply an image, embedded via markdown syntax just like any other image.
I and some other users have written a userscript which allows these and other
<kbd> buttons to be inserted with a single keyboard shortcut.
The links for each icon are as follows:
The icons originate from the wiki, but it was decided during the development of the userscript to host them on imgur in case the wiki versions changed.