https://www.w3schools.com/tags/ref_urlencode.asp?bcsi-ac-4d57fec82d0c41f9=271918E500000005GWA6BeQ6JifHv9+eq2S/b7a4YSJMAAAABQAAAHXHRgCAcAAAAAAAAAGYAAA=

From what I can tell SharePoint uses similar ASCII codes however the % seems to be replaced by _x00

For example I know the following special characters in SharePoint:

  • _x005f_
    • Underscore (_)
  • _x0020_
    • Space ( )