An accelerator is usually a letter used with a Meta key (such as Ctrl or Alt) to activate some element of a GUI without using the mouse to point and click at it.

guibutton, guiicon, guilabel, guimenu, guimenuitem, guisubmenu, keycap, keycode, keycombo, keysym, menuchoice, mousebutton, shortcut

<article xmlns='http://docbook.org/ns/docbook'>
<title>Example accel</title>

<para os="windows">You can exit most Windows applications by selecting
<guimenuitem><accel>Q</accel>uit</guimenuitem> or
<guimenuitem>E<accel>x</accel>it</guimenuitem> from
the <guimenu><accel>F</accel>ile</guimenu> menu.
</para>

</article>