With a small square in its corner
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The square drawn in a right angle simply is to indicate that the angle is, indeed, 90 degrees.
A protractor will indicate an angle that has to be made.
I believe that it's not called anything, it is just a symbol to indicate that the angle is a right angle (90 degrees)
It is an indicator that the angle formed at that point is a right angle (90 degrees).The small square at the crossing point of two perpendicular lines serves to indicate that the two lines indeed form an angle of 90 degrees.
Because a right angle is a right angle.