AltCar or AltGr: What They Are and How to Use Them,
AltGr is seriously awesome for writing up scientific documents. For instance, AltGr+m turns into μ, or you can manually input the code AltGr+ to get μ. Here's a list of codes with lots of other useful symbols!. 
Altgr. mechaniker3 Microsoft provides a US-International keyboard layout that uses AltGr (or right-hand Alt or Ctrl+Alt) key to produce more characters: Red characters are dead keys ; for example ä can be entered with " a.
AltGr – Wikipedie The AltGr, or Alternate Graphic, key is a relic from the days of text-based user interfaces (TUIs), where it was used to create box-drawing characters such as┎ and â”°. Nowadays, it functions in a similar way to Shift: when held down with another key, it provides a character that isn’t shown on the keyboard.
AltCar or AltGr: What They Are and How to Use Them As I have to type in languages with accents, I absolutely need the functions provided by “Alt Gr” (US intl layout). According to your experience, especially with 60% layout, do the right Alt key is a true “Alt Gr” or just a clone (i.e same function) of the left Alt?.
Altgr. mechaniker4 You might see a key named Alt Car or AltGr on your keyboard. It normally just acts like another Alt key but it has a secondary function that allows you to easily type special characters. Here’s how you can use it.
What Is Alt Gr Key And How To Use It in Windows 7/10/11 What is the Alt Gr key, how do you use it, and how to enable or disable Alt Gr key on Windows 11/10 keyboard (non-US keyboards)? This post discusses it all.
AltGr key - Wikipedia IBM named this key "alternate graphic" and it's not a substitute for CTRL + ALT, though CTRL + ALT was implemented as a substitute for ALT GR in Windows. It is a key modifier (like CTRL or SHIFT) that enables a different input than is normally expected of a key.
Altgr. mechaniker2 AltGr (also Alt Graph) is a modifier key found on many computer keyboards (rather than a second Alt key found on US keyboards). It is primarily used to type special characters and symbols that are not widely used in the territory where sold, such as foreign currency symbols, typographic marks and accented letters. [1].