Windows
Hold Alt and type 247 on the numeric keypad.
Math
Copy the character, or use the shortcut that matches your keyboard and app.
Hold Alt and type 247 on the numeric keypad.
Character Viewer → almost
Type 2248 then Alt + X
Insert → Special characters → approximately
Click the keycap, then paste with Ctrl+V or Cmd+V.
Num Lock on, hold Alt, type 247, release Alt.
Use the Unicode, HTML, CSS, or JS value below in documents and stylesheets.
U+2248≈≈\2248\u{2248}Alt + 247