A dart.
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A diamond or a quadrilateral.
congruent concave convex
It is also called an arrowhead or chevron. It is the shape that you will get if you take a kite and push its apex down until it becomes concave.
How about a kite which is a 4 sided quadrilateral.
a kite is a shape in geometry, and math. it resembles a rhombus, a diamond like shape used in math and geometry.