Singleton
WordNet
noun
(1) The playing card that is the only card in a suit held in a bridge hand as initially dealt
(2) A set containing a single member
(3) A single object (as distinguished from a pair)
WiktionaryText
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.
Noun
- A singleton (lone playing card).
- A singleton (design pattern, class, set).