Topic: Purpose of $sign in rep107.php

What is the purpose of $sign in rep107.php - it always has the value of 1 and nowhere does it get changed. Is it to provide an integer value? If so, what use is round2() in which it occurs?

It also appears in rep109.php, rep111.php, rep209.php without declaration in it (hopefully it came from some included file!).

It appears in rep113.php with a constant value of -1 and nowhere does it get changed.