Two I’ve visited are ascii-code.com and another is Special Characters — Alt Code Sequences. Remember to press and hold the Alt key and enter a 0 (zero) before each code; for example ...

You can enter an ASCII symbol into a document using any Windows-compatible computer by holding down the ALT key while typing the character code number. For example, holding the ALT key while ...

more commonly known as ASCII, is the standard for representing all upper-case and lower-case Latin letters, numbers, punctuations, etc as a code number used by computers. For example, the letter M ...