where is the altgr key on a mac
AltGr key AltGr (also Alt Graph, or Right Alt[1]) is a modifier key found on some computer keyboards and is primarily used to type characters that are unusual for the locale of the keyboard layout, such as currency symbols and accented letters. On a typical, IBM-compatible PC keyboard, the AltGr key, when present, takes the place of the right-hand Alt key. In macOS, the Option key has functions similar to the AltGr key.
German keyboard layout The characters ², ³, {, [, ], }, \, @, |, µ, ~ (and, since the late 1990s, €) are accessed by holding the AltGr key and tapping the other key. The Alt key on the left will not access these additional characters. Alternatively Ctrl+Alt and pressing the respective key also produce the alternative characters on some operating systems.