@quetzatl@jscholes That would be what we think of as the FN key, which on more recent Mac keyboards actually has the globe symbol printed on it, which matches the iOS "globe" key's icon which is used to change between multiple software keyboard languages. I don't remember off hand what it does by default now because I customised the settings but I think a single or double press on its own does indeed cycle languages now. The menu to customise what it does also just uses that globe Emoji which makes VoiceOver's reading of it just as fun.
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