A mathematical object which consists of a set of a single element, making it a 1-tuple. The yin-yang is also known as the monad.
See alsoHexad, n-Tuple, Quadruple, Quartet, Quintet, Tetrad, Triad, Triple, Twins, Yin-Yang
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Weisstein, Eric W. "Monad." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Monad.html