What is this? I haven't seen or heard of this one "~!^~!^~!.html"

[Thu May 20 10:36:45 2004] [error] [client 61.135.131.173] File does
not exist: /var/www/html/~!^~!^~!.html

Does anyone have an idea of what the "~!^~!^~!" translates to?

Thanks