Noun
Kleene star (plural Kleene stars)
English Wikipedia has an article on:Kleene starWikipedia
(logic, computing theory) The asterisk, *, used as an operator to concatenate zero or more strings from a given set, widely used in regular expressions.
Closure properties The class PSPACE is closed under operations union, complementation, and Kleene star. Source: Internet
Formal languages The Kleene star and Kleene plus operators used to express repetition in formal languages are idempotent. Source: Internet
In homomorphisms on formal languages, the ∗ operation is the Kleene star operation. Source: Internet
The Kleene star is defined for any monoid, not just strings. Source: Internet
The redundancy can be eliminated by using Kleene star and set union to find an interesting subset of regular expressions that is still fully expressive, but perhaps their use can be restricted. Source: Internet
The set of all words over an alphabet Σ is usually denoted by Σ * (using the Kleene star ). Source: Internet