What Are These Arrows (and why are they still here)?

Here is an interesting article published on the Windows Mobile Team blog about the little signal strength icon at the top of the screen. The article explains why it's permanently there and its impact on our daily use of our devices.

"If you've used a Windows Mobile phone device, you've probably seen the little signal strength icon at the top. If you're lucky, you live in a place with good signal strength and see many bars. If you're like me, you live in a cellular dead spot and are happy when you get one bar.
On many non-WM phones, the part of the icon that's not bars looks something like an antenna--a vertical line with a triangle on top of it. While you sometimes see this antenna icon on WM Phones, it's often something else. And, what that "something else" is varies from device to device. On some it's a G. On others it's an E. On still others it's two arrows pointing left and right. What are these things? What did they do with our beloved antenna triangle? And why won't they go away?" Read more...