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.
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A concave quadrilateral. An arrowhead or a delta, for example.
An arrowhead is also called a delta. It is a concave quadrilateral with one axis of symmetry.
concave
No.
A chevron or arrowhead.