Just that, a "rectangle".
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Rectangle Prisim
A rectangle is irregular. The only regular rectangle is a square, so any rectangle that is NOT a square is irregular.
A rectangle is also a polygon, a parallelogram, and a quadrilateral with four right angles.
A rectangle is a rectangle no matter its orientation, it does not need to be horizontal or vertical to be a rectangle, the term applies only to the internal angle of the corners which of course must be 90 degrees.
It is a oblong