Unicode characters for/approximating symbols used on OS X, PlayStation, and Xbox input devices: https://gist.github.com/lucasrizoli/4178397
Stuff like Command (⌘), Menu (☰), A buttons (🅐, Ⓐ), PlayStation buttons (△, ☐, ⭘, ⨉). Useful for quickly mocking stuff up without having to draw icons or use bitmaps.
Of course, your browser or OS may want to intrude to translate them into cute bitmaps of emoji or whatever, so YMMV.
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