Is there something that has an "unknown" or "undefined" number?

[Helloperson91412]

I am making a leaderboard, and the list I am using has your username, then periods, then the score . I am using a checker, but it says that my username is not in the list, so I was going to try and make a “High Score Table contains join username join ㅤ. . . ‘undefined number’”, and I was wondering if there is that “undefined number” block or something that represents an unknown number in CreatiCode.

EDIT: Never mind, I found a solution. But, while we are at it, what is a way to sort a list by a certain spot in the entries and not by what comes first?