Some people say it is the "I" sign, others say it is the "crosshair" and some say it is somewhere in the middle.
It would be good to clear this issue up once and for all. Please don't just write "I" or crosshair with no explanation. I am sure there are lots of guys out there with this question in their minds. So for the community to be sure, you need to provide a very solid proof or justification.