CentralNotice From Wikipedia, the free encyclopedia Jump to: navigation , search The Knights of the Lambda Calculus' recursive emblem celebrates LISP's theoretical foundation, the lambda calculus . Y in the emblem refers to the fixed-point combinator and the reappearance of the picture in itself refers to recursion . The Knights of the Lambda Calculus is a semi-fictional organization of expert LISP and Scheme hackers . The name refers to the lambda calculus , a mathematical formalism invented by Alonzo Church , with which LISP is intimately connected, and references the Knights Templar . There is no actual organization that goes by the name Knights of the Lambda Calculus ; it mostly only exists as a hacker culture in-joke. The concept most likely originated at MIT . For example, in the Structure and Interpretation of Computer Programs video lectures , one of the...