Degree gives the number of radians in one degree. It has a numerical value of .
You can multiply by Degree to convert from degrees to radians.
Example: 30 Degree represents .
Degree can be entered in StandardForm and InputForm as , deg or \[Degree].
Degree is printed in StandardForm as .
See The Mathematica Book: Section 1.1.3, Section 3.2.6 and Section 3.2.8.