Alt Graph Key
The Alt Graph key, usually labeled “AltGr”. This key is a modifier key. It is for inserting special characters. Press AltGraph+key to insert a special char.
For example, when using US international layout:
- AltGraph+e inserts é
- AltGraph+c inserts ©
This key is on some European keyboards. It's also on Sun Microsystem Type 6 Keyboard .
Which character is inserted with what key is dependent on the keyboard layout.
- On Microsoft Windows, the right Alt becomes AltGraph if you set your keyboard layout to one of European language layouts. [see International Keyboard Layouts]
- On macOS, the ⌥ option is the AltGraph.
The first key of similar idea, seems to be the The Top Key of the Stanford AI Lab (SAIL) keyboard