In geometry 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. The geometric object is named for the wind-blown, flying kite, which in its simple form often has this shape. Equivalently, a kite is a quadrilateral with an axis of symmetry along one of its diagonals. Any quadrilateral that has an axis of symmetry must be a kite or an isosceles trapezoid. Kites and isosceles trapezoids are dual: the polar figure of a kite is an isosceles trapezoid, and vice versa. A kite, as defined above, may be either convex or concave, but the word "kite" is often restricted to the convex variety. A concave kite is sometimes called a "dart" or "arrowhead", and is a type of pseudotriangle.

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