Tetrahedron

From Fancyclopedia 3
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From Fancyclopedia 2, ca. 1959
Speer's publishing house logo

A triangular pyramid. In position of two such-shaped spaceships set for ramming, a pair of tetrahedra bracketing a publication's title indicate that it's from Speer's publishing house.

From Fancyclopedia 1, ca. 1944
A solid bounded by four planes, the smallest number that can enclose a solid; a triangular pyramid. In positions of two such-shaped spaceships set for ramming, a pair of tetrahedrons around a publication's title indicates that it comes from Speer's publishing house.

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