What is "wildcard"

n. 1 (context computing English) A character that takes the place of any other character or string that is not known or specified. 2 (qualifier: also written wild card) An uncontrolled or unpredictable element. 3 (qualifier: also written wild card) An element, often deliberately concealed, which is withheld for contingency. 4 (context sports card games English) (alternative form of wild card English)

Terence Trent d'Arby's Wildcard!, or simply referred to as Wildcard, is Terence Trent D'Arby's fifth album. It was released in 2001 on his own independent record label Sananda Records following a six-year absence from the spotlight.

Wildcard is a self-released EP by Pennywise. It was originally released in 1989 as a 7" release and again in 1992, on the compilation album A Word from the Wise/Wildcard, along with the first EP A Word from the Wise.

Wildcard (John Crenella) is a fictional character, a superhero in the Marvel Universe, member of the Strikeforce: Morituri. The character was created by Peter B. Gillis and Brent Anderson.

The wildcard ? in Java is a special type parameter that controls the type safety of the use of generic (parameterized) types. It can be used in variable declarations and instantiations as well as in method definitions, but not in the definition of a generic type. This is a form of use-site variance annotation, in contrast with the definition-site variance annotations found in C# and Scala.