It is called a "right angle".
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A right angle is exactly 90 degrees
The corner of a square measures 90 degrees which is a right angle.
An acute angle is lower than 90 degrees. An obtuse angle is higher than 90 degrees. But lower than 180 degrees. A right angle is exactly 90 degrees. A straight angle is exactly 180 degrees. A reflex angle is higher than 180 degrees. A Circle is exactly 360 degrees.
An angle less than 90 degrees is an "acute angle". An angle of exactly 90 degrees is a "right angle". An angle more than 90 and less than 180 degrees is an "obtuse angle". An angle of exactly 180 degrees is a "straight angle". An angle of more than 180 degrees is a "reflex angle".
An acute angle is one that is between 0 and 90 degrees. A right angle is exactly 90 degrees. An obtuse angle is one that is between 90 and 180 degrees. Acute.