555����%2527%2522\'\"

It looks like a double URL-encoded string with some unreadable (replacement) characters.

What happens:

• %25 is the percent sign. So %2527 decodes to %27, and %2522 decodes to %22.
• If you decode those again, %27 becomes a single quote ('), and %22 becomes a double quote (").

So:

• Original: 555%2527%2522'"
• After one decode: 555%27%22'"
• After two decodes: 555'" (i.e., a backslash-quote and a backslash-quote: '")

Note on the "":

• Those are Unicode replacement characters. They indicate that some bytes that were meant to be text got misinterpreted as the wrong encoding. Without knowing the original bytes/encoding, they can’t be reliably recovered.

If you want, I can show how to do this in code (Python or JavaScript) to decode twice. Do you want the example in a specific language?