Windows: Hold `Alt`, type `0176` on the numeric keypad, release `Alt`
Windows (Character Map): Open Character Map → select the degree symbol `°` → Copy
Windows (Keyboard): Press `Ctrl` + `Shift` + `U`, type `00B0`, press `Enter`
macOS: Press `Option` + `Shift` + `8` (on many layouts)
macOS (Unicode): Hold `Option`, type `00B0`, press `Return`
Linux (Unicode): Press `Ctrl` + `Shift` + `U`, type `00B0`, press `Enter`
HTML: `°`
CSS: ` 0B0` or `content: “ 0B0”;`
Unicode: `°` (U+00B0)