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Tetrapod--Caltrops
Model number 778 at Tamasoft (Pepakura Designer) is listed as a Tetrapod. But the original name for this shape, made from sharpened spikes, was "caltrops" -- one of the few English singular nouns that end in the letter s. I'm not sure of the origin or purpose of this tetrapod. But caltrops were wicked threats to the feet of soldiers and horses -- and easy to strew about, as any way you threw them a sharp point stuck up.
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