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Have you ever heard of google?

It's used for Radiens. And why would you want to remove it? It's not hurting you.
 
Radians. Used in all sorts of technical calculations. It's an angular measurement analogous to degrees. 2pi radians = 360 degrees.

To remove it: turn your iDevice to portrait mode. 😉
 
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5)

Tap "DEG" in the bottom left corner.
 
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