I was on my MacBook and when I moved the mouse point over the mic icon above the channel tree while connected to a server I noticed a tooltip popped up, but it mentioned using “ALT+Click”. On macOS I find it should be “option+Click”. Also, in key binding it refers to the option key as ALT when I use that key in a binding.
It’s called ALT and/or Option.
I got both names on one key
But yes for future ALT should be named to Option.