The rays are called sides and the common endpoint is called vertex.
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The common end point of the sides (or arms) of an angle is the vertex of the angle.
The common end point of the sides of an angle is called the vertex. The sides are referred to as rays.
Angle
vertex
Placing a question mark at the end of a phrase does not make it a sensible question. Try to use a whole sentence to describe what it is that you want answered.I assume the question is about a "common END point", and although you have not said so, what you want is to know what it is called. If that is the case, then the answer is an angle.