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A word used to describe a person that exhibits sigma (social archetype) characteristics. The ending -moid (steming from "humanoid") indicates that a person named a sigmoid is inherently a sigma human being and gains such sigma characteristics from a deeper level of his human psyche. "Sigmoid" indicates that the sigma status of this person is not purely a social construct created by the social circle of that person but rather defines a more profound psychological sigma level of his mind.
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