Windows
Hold Alt and type 0191 on the numeric keypad.
Accents
Copy the character, or use the shortcut that matches your keyboard and app.
All N accentsHold Alt and type 0191 on the numeric keypad.
Character Viewer → inverted question mark
Type 00BF then Alt + X
Insert → Special characters → inverted question mark
Click the keycap, then paste with Ctrl+V or Cmd+V.
Num Lock on, hold Alt, type 0191, release Alt.
Use the Unicode, HTML, CSS, or JS value below in documents and stylesheets.
U+00BF¿¿\00BF\u{00BF}Alt + 0191