The Insert ASCII command inserts a character that you specify with its ASCII code.
Radix
Selects the input radix of the character code you typed. If Auto is selected, then the input radix is determined from the text you type. For example, if you type 0x20, then the radix is assumed to be Hex, and ASCII 32 is inserted.
Character Code
This is the ASCII code of the character you want to insert.