Eight Curve, Eight Lemma, Eight-Point Circle Theorem, Eight Surface, Figure Eight, Figure Eight Knot, Lemniscate, Octagon, Octahedron, Tesseract
Wells, D. The Penguin Dictionary of Curious and Interesting Numbers. Middlesex, England: Penguin Books, pp. 71-73, 1986.
Eric W. Weisstein. "8."
From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/8.html
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