yes
A dart.
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.
A kite or, if concave, an arrowhead or chevron.
The bridle of a kite is the structure that connects the flying line to the kite. It is usually made up of strings or cords that help to distribute the tension and control the angle and stability of the kite in flight. The bridle plays a crucial role in how the kite responds to the wind and the flyer's input.
Rectangle, rhombus, parallelogram, trapezium, kite. Also a chevron, which is a concave 4-sided shape.
It is also called an arrowhead. It is a kite with one of the vertices between equal sides "pushed in" so that it becomes a reflex angle.
From Wikipedia: '...a kite, or deltoid, is a quadrilateral with two disjoint pairs of congruent adjacent sides, in contrast to a parallelogram, where the congruent sides are opposite.' In other words, a kite consists of two isosceles triangles joined at the base. Beginning with a particular isosceles triangle, it will always be possible to construct from it one kite that has equal diagonals (given that the kite may be either convex or concave). Hence an infinite number of kites do have equal diagonals, but many do not. A notable example of a kite that does have equal diagonals is a square.
Depending on how they are joined, you can get a square, rectangle, rhombus, parallelogram, kite, arrowhead (or delta). You could also get a concave pentagon or hexagon.
The opposite of convex is concave. Concave shapes have an inward curve, while convex shapes have an outward curve.
plano concave
Concave, because you can connect the corners from the outside.
Concave is a property of [irregular] polygons. A parallelogram cannot be concave.