It's disappointing that OS-included font support for these has apparently lagged. iOS 13.2 supports emoji from Unicode 12[1], but doesn't ship with a font that includes these symbols. Anyone know if any OSes do support them?
By the way, if you're viewing them on the unicodepowersymbol.com website, they show up because of a web font included on the page. So here they are on a site without the font:
⏻⏼⭘⏽⏾
[1] https://emojipedia.org/apple/ios-13.2/new/