Windows
Hold Alt and type 530 on the numeric keypad.
Accents
Copy the character, or use the shortcut that matches your keyboard and app.
All R accentsHold Alt and type 530 on the numeric keypad.
Character Viewer → r inverted breve
Type 0212 then Alt + X
Insert → Special characters → R inverted breve
Click the keycap, then paste with Ctrl+V or Cmd+V.
Num Lock on, hold Alt, type 530, release Alt.
Use the Unicode, HTML, CSS, or JS value below in documents and stylesheets.
U+0212ȒȒ\0212\u{0212}Alt + 530