What's the official name for an extendable camera pole/mounts?

I really want something to help me record videos on my skateboard. I've seen these poles where one end has a camera such as a GoPro attached to it. Is there such a thing on the market for an iPhone 4s?

They are called "booms", "jigs" and "cranes"

Like Ace said, if marketed to photographers they are called booms, cranes, jigs.

If it is market to home DYI painters, it is an extension pole or painter's pole and about 1/4 the cost.