AltGr key
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AltGr is a modifier key found on computer keyboards. It is primarily used to type characters that are used less frequently in the language that the keyboard is designed for, such as foreign currency s
The AltGr key is the first key to the right of the space bar.
Sun Microsystems keyboard, which labels the key as Alt Graph
Compose key
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A compose key is a key on a computer keyboard that indicates that the following keystrokes trigger the insertion of an alternate character, typically a precomposed character or a symbol.
AltGr key
…key on Linux produces many other characters and symbols, e.g. ¹²³€½{[]}@łe¶ŧ←↓→øþæßðđŋħjĸł«»¢“”nµΩŁE®Ŧ¥↑ıØÞƧЪŊĦJ&Ł<>©‘’Nº×÷· (If reconfigured as a compose key, an even larger repertoire is available). With the UK extended keyboard setting (below), ChromeOS offers a large repertoire of symbols and precomposed…
The compose key on a DEC LK201 keyboard is the leftmost key on the bottom row.