Singleton

Singleton may refer to

• Singleton (mathematics), a set with exactly one element
• Singleton (global governance), a single decision-maker at the highest level of the world order
• Singleton pattern, a design pattern used in object-oriented programming to permit no more than one instance of a class
• Singleton bound, used in coding theory
• Singleton field, used in conformal field theory
• Singleton, another name for the Catawba (grape)
• Singleton variable, a variable in computer programming that is referred to only once
• A character encoded with one unit in variable-width encoding schemes for computer character sets
• A person that is not a twin or other multiple birth
• Singleton (lifestyle), a self-description of individuals without romantic partners, particularly applied to women in their thirties introduced in the novel and film Bridget Jones's Diary
• "Singleton", a short story by Greg Egan
• An empty tag or self-closing tag in XHTML or XML coding
• A single card in a suit, as part of a hand in contract bridge
• In linguistics, a consonant that is not a geminate