When people use degrees, they either use "degrees" as in 30 degrees, or the little circle as in 30o. For Radians, they might say radians or possibly R or Rad.
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That symbol is called the radical.
The symbol that you describe seems to be the greek letter Phi. It is normally used to indicate a variable that is an angle, just as x is used to indicate a variable that is a numeric quantity.
It can be though it is more often used to denote a variable.
It is important to know the terms used while learning math. A non included angle is when the sides of the shape do not make the angle.
An angle bracket is either of a set of brackets, ? and ?, used to enclose text, or one of the inequality signs, < or >, when used as brackets, such as in HTML.