Root Key On Keyboard [portable] - Square

This only works with a numeric keypad. If you’re on a laptop without a keypad, enable Num Lock (Fn + NumLk) or use the Character Map (see below).

Finding the square root symbol ($\sqrt{}$) on a keyboard depends on whether you are using a Windows PC, a Mac, or a smartphone. square root key on keyboard

If you are writing a formal paper or working with data, you have more "pro" options: This only works with a numeric keypad

Both render as: √