Radek, we always called it "the finger" for obvious reasons.
I've added your correction to the caption :)
That is indeed funny. I think I have a good picture of it in my files somewhere. I'll have to look for it. ; )
please post some shots of this formation if you have them. The photos on the page so far are pretty "one-sided" - I don't even have a nice overview shot of the whole wall.