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360 degrees is a full rotation; beyond that there is more than one rotation and this is of interest in algebra but there is no name for this.
There is not a special name. You simply use the name for the angle which is left after you subtract 360 degrees from the angle.
Any angle past 90 degrees is called an obtuse angle.
An angle under 90 degrees is called acute. There is no specific name for angles smaller than 45 deg.
It has 9 sides and is called a nonagon