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Reference.org
Singleton (mathematics)
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a singleton (also known as a unit set or one-point set) is a <a href="/facts/Set_(mathematics)/BfucfHMq">set</a> with <a href="/facts/Uniqueness_quantification/qBpdIqel">exactly one</a> <a href="/facts/Element_(mathematics)/Q2mx1vHL">element</a>. For example, the set { 0 } {\displaystyle \{0\}} is a singleton whose single element is 0 {\displaystyle 0} . </p>