"Filled triangle" is a term from the game of Go (Wei Qi/Badouk) and refers to the shape of stones formed by White (0) below. Black is shown by (X):


Note that this is similar to the empty triangle, but with an opponent's stone inside the triangle. Unlike the empty triangle, though, the filled triangle is a good shape, because it puts a pressure on the opponent's stone and provides a lot of thickness.

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