Windows
Hold Alt and type 364 on the numeric keypad.
Accents
Copy the character, or use the shortcut that matches your keyboard and app.
All U accentsHold Alt and type 364 on the numeric keypad.
Character Viewer → u breve
Type 016C then Alt + X
Insert → Special characters → U breve
Click the keycap, then paste with Ctrl+V or Cmd+V.
Num Lock on, hold Alt, type 364, release Alt.
Use the Unicode, HTML, CSS, or JS value below in documents and stylesheets.
U+016CŬŬ\016C\u{016C}Alt + 364