it is a somehow slanted triangle.
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There is no special name for such a shape.
a rectangle
A four-sided shape with one right angle is a quadrilateral. There is no more specific term, unless it has more than one right angle or has equal sides.
If a shape has four sides and you know that it has one right angle, yet you do not know anything else about the shape, then the most specific geometric term you can assign to the shape is "quadrilateral". Unless you know about the other angles and side lengths, nothing more can be said.
there is no unique name for a shape like that as it would just be called an irregular quadrilateral