Windows
Hold Alt and type 466 on the numeric keypad.
Accents
Copy the character, or use the shortcut that matches your keyboard and app.
All O accentsHold Alt and type 466 on the numeric keypad.
Character Viewer → o caron
Type 01D2 then Alt + X
Insert → Special characters → o caron
Click the keycap, then paste with Ctrl+V or Cmd+V.
Num Lock on, hold Alt, type 466, release Alt.
Use the Unicode, HTML, CSS, or JS value below in documents and stylesheets.
U+01D2ǒǒ\01D2\u{01D2}Alt + 466