Triangle.

A triangle is one of the basic shapes of geometry: a polygon with three corners or vertices and three sides or edges which are line segments. A triangle with vertices A, B, and C is denoted ABC.

For more information, http://en.wikipedia.org/wiki/Triangle.

For further information, refer to Mandy Say Tsui Teng.

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Okay I just passed out due to a shape which caused my incurable laughing disorder.