AltGr
AltGr, an abbreviation for "alt-graphics," is a keyboard state used to type many characters with accents.
On US and UK keyboards, Windows maps the combination Ctrl-Alt to AltGr; in the rest of the world, the right Alt key is mapped to AltGr. For this reason, Ctrl-Alt should not be used as a modifier in Windows shortcuts (see external link below).
The Euro currency symbol (€) and the broken pipe symbol (¦) are the only keys on UK keyboards that require the use of AltGr, making it one of the most unused of all the keys.
See also
