The sybol or the degree sign is °. To make the symbol you just press down Alt and then type the #'s 0176.
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You hold down the option key or alt, and click zero, you will then get yourself a degrees symbol like this: º
91 degrees Celsius is written as 91°C (the degree symbol is on the Character Map).
The degrees of unknown angles on triangles are represented by thieta, the symbol for which looks like a 0 with a line through it. The degrees of a triangles angles all add up to 180 degress.
an acute angle is always less the 90 degrees. its different shapes depending on the number of degrees. example would be this symbol on a keyboard: <
I believe that it's not called anything, it is just a symbol to indicate that the angle is a right angle (90 degrees)