Windows
Hold Alt and type 559 on the numeric keypad.
Accents
Copy the character, or use the shortcut that matches your keyboard and app.
All O accentsHold Alt and type 559 on the numeric keypad.
Character Viewer → o dot above
Type 022F then Alt + X
Insert → Special characters → o dot above
Click the keycap, then paste with Ctrl+V or Cmd+V.
Num Lock on, hold Alt, type 559, release Alt.
Use the Unicode, HTML, CSS, or JS value below in documents and stylesheets.
U+022Fȯȯ\022F\u{022F}Alt + 559