I am looking at alternative navigation menu designs for

Hi,

I am looking at alternative navigation menu designs for the front end. I would like to achieve the same 'folding/collapsible' effect of the WordPress admin menu in that only icons are shown in the vertical menu, and when the mouse hovers over the menu, it then expands to show the text for the menu item.

I have Googled to no avail, does anyone know what this type of menu is called, and whether there is a plugin available for having this type of menu in the front end?