:Knights of the Lambda Calculus: n. A semi-mythical organization of
wizardly LISP and Scheme hackers. The name refers to a
mathematical formalism invented by Alonzo Church, with which LISP
is intimately connected. There is no enrollment list and the
criteria for induction are unclear, but one well-known LISPer has
been known to give out buttons and, in general, the *members*
know who they are....
-- The AI Hackers Dictionary
HCF: /H-C-F/ n. Mnemonic for `Halt and Catch Fire' any of
several undocumented and semi-mythical machine instructions with
destructive side-effects, supposedly included for test purposes on
several well-known architectures going as far back as the IBM 360....