6.17.2 Accelerator Keys
An accelerator key for a menu title or option is the underlined letter of the caption. For example Object menu title can be accessed by pressing Alt + O.
To indicate which letter is to be underlined, precede it with an ampersand (&). For example File is entered as &File.
Every menu item should have an accelerator key so that the menu can be used from the keyboard. Accelerator keys must be unique inside a submenu.