Time limit above 999, random characters in timer

[1033Forest]

http://chipschallenge.wikia.com/wiki/Time_limit

It says from this: "For time limits above 999, the info panel displays a random character as the first digit in either yellow or green, followed by the last two digits of the time limit, in either yellow or green."

So what are some of these random characters? I'm interested in knowing. I actually plan to make some levels with over 999 time limit after finding this out.