 Due to English being the foundation-language, or lingua franca, of most computer programming languages these variables are commonly seen even in programs and examples of programs written for other spoken-language audiences.The typical names may depend however on the subculture that has developed around a given programming language.Metasyntactic variables used commonly across all programming languages include "foobar", "foo", "bar", "baz", "qux", "quux", "quuz", "corge", "grault", "garply", "waldo", "fred", "plugh", "xyzzy", and "thud"; several of these words are references to the game "Colossal Cave Adventure".