What's the difference between a tangram and a tanagram?

the letter "a" between the "n" and the "g" ??

Reiny is right. Only tangram is a word.

http://m.reference.com/d/search.html?q=tangram

A tangram and a tanagram are actually the same thing, just spelled differently. However, the correct term is "tangram." A tangram is a classic Chinese puzzle consisting of seven flat geometric shapes called tans. These tans are traditionally made of wood or cardboard and can be arranged to form various shapes and figures. The word "tangram" comes from the Chinese words "tan," meaning "to disperse" or "to separate," and "gram," meaning "picture" or "graph."

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