## SINGLETON

### Singleton

In mathematics, a**singleton**, also known as a

**unit set**, is a set with exactly one element. For example, the set {0} is a singleton.

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### singleton

#### Noun

- A playing card that is the only one of its suit in a hand, especially at bridge.
- A single object, especially one of a group.
- A class that may not be instantiated more than once, i.e. that implements the singleton design pattern.
- A set with exactly one element.
- A child or animal that is born singly, not as a twin or other multiple birth.

*The above text is a snippet from Wiktionary: singleton*

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and as such is available under the Creative Commons Attribution/Share-Alike License.