Windows
Hold Alt and type 243 on the numeric keypad.
Math
Copy the character, or use the shortcut that matches your keyboard and app.
Hold Alt and type 243 on the numeric keypad.
Option + <
Type 2264 then Alt + X
Insert → Special characters → less
Click the keycap, then paste with Ctrl+V or Cmd+V.
Num Lock on, hold Alt, type 243, release Alt.
Use the Unicode, HTML, CSS, or JS value below in documents and stylesheets.
U+2264≤≤\2264\u{2264}Alt + 243