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I've seen the word triagonal on the Yahoo 3-D Chess Group many times, always meaning the same thing, and I don't remember anyone having to ask what it meant. I didn't know what it meant when I first joined that group but I quickly figured it out. It made sense to me immediately when I thought about it; I consider 'triagonal' to be as clear and apt as 'tromino,' coined by analogy with 'domino,' with perfect insouciance toward etymological correctness. As long as the word is being used in the context of a 3-D cubical grid I don't see what confusion can result. I agree Gilman's comment, applying it to a 2-D hexagonal grid, seems confused, but then his usages are idiosyncratic (which, indeed, is the whole point of his article).