Torpedox on "Plugin-Development"

Hello,

I am developing a plugin for Wordpress. It's my second one and I am facing the following issue:

I added a menu for my plugin in Wordpress-Backend. I have also added an Icon to this menu. Everything works fine, but the next to the menu, a small Symbol is shown. See screenshot below:

<img src="http://img5.fotos-hochladen.net/uploads/snap20ewkq15dma.png" border="0">
http://img5.fotos-hochladen.net/uploads/snap20ewkq15dma.png

What does this mean?
It is shown in Internet Explorer. Firefox doesn't show it.
I used "DebugBar" for debugging, but no error is shown...

Thank you