What is an "arrowfinger"?

What is an "arrowfinger"? An arrowfinger is the old school arrow-hand pointing on the wall. Funny enough new media picked it up years ago and it is now also what your cursor pointer turns into when you roll your mouse over a hyperlink or web link. An arrowfinger is extremely powerful these days. It not only points your way but is the tool for a heck of a lot of commerce, namely digital or web commerce.