What is this?

I'm pretty sure that it belongs to windowssearch.exe.

It's not running. I found a task in my task manager that had to do with searching but when I ended it the icon was still there.

Jacee said:

Download Process Explorer Process Explorer
You may be able to determine which process is running the icon

Well see I ended explorer.exe and reopened it and it went away.

Yeah. But my JDownloader icon didn't come back either. So I'm not sure if it removed it or just hid it.

Nope. I've looked more than once. I never installed the update for it.

Kari said:

That is most definetely a symbol for Windows Search, visible in Taskbar when there's an Explorer window with search results open (search in Start menu search field > Show more results, or direct search in Explorer)

I wasn't searching for anything when the icon popped up.

And when I do search for something, nothing happens. The icon doesn't show.