How do I type the square root symbol (√) in Windows?
In short it's ALT + 251 (note, no preceding zero)
Unicode it is U-221A
If that doesn't work then:
Press and hold down the Alt key. Press the + (plus) key on the numeric keypad. Type the hexidecimal unicode value (221A). Release the Alt key.
HKEY_CURRENT_USER\Control Panel\Input Method
and add a
EnableHexNumpad. Set the value to
1. Log out and log in.
Now you can use
ALT <numpad +> 221A
As for why your ALT codes don't work:
Manufacturers of PCs have character sets in their hardware/firmware. These are called OEM code pages by Windows. Windows also has a standard Latin character set for english speaking regions called Windows-1252, which it uses for most non-unicode programs. When you type ALT 251
¹ you use the OEM set which can vary between each PC (Mine is code page 850). When you type ALT 0251
û, it uses the Windows-1252 character set.
Some others were saying that
<substitute (SUB) character> works but from my experience, any value above
ALT 255 or
ALT 0255 just gets converted back to a value between
ALT 0 and