That looks like an extractor spring, my friend. 
Haha, yes, maybe it does, although it looks a little longer and skinnier than the average extractor spring to me.
However, it is quite literally the
ejector spring for an Omega series pistol. I suppose most pistols don't have any such thing as an ejector spring, but Omega series CZ's have them. Not that I'm an expert on which pistols have which springs. My Sig doesn't have an ejector spring. My Glocks didn't have them either.
Anyway, to remove the Omega series ejector, you have to tilt the ejector forward against the tension of the spring, then slide the ejector forward, to get it unhooked. If you aren't careful, that spring goes flying as the ejector comes out.
I never launch extractor springs because my punch is holding the extractor in place after driving the pin out, so it's much easier to control.