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Empty Triangle
   

This shape is an empty triangle.
It is also called the Devil's shape (onigatachi), because it brings to mind the long nose of one kind of Japanese demon.


[Diagram]
Diag.: Empty Triangle

It is generally a bad shape. (See TheEmptyTriangleIsBad.)
But it can also be good. (See GoodEmptyTriangle.)



This is a copy of the living page "Empty Triangle" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.