Singleton

Singleton may refer to:

==Sciences, technology== ===Mathematics=== Singleton (mathematics), a set with exactly one element Singleton field, used in conformal field theory === Computing === Singleton pattern, a design pattern that allows only one instance of a class to exist Singleton bound, used in coding theory Singleton variable, a variable that is referenced only once Singleton, a character encoded with one unit in variable-width encoding schemes for computer character sets Singleton, an empty tag or self-closing tag in XHTML or XML coding