ALGOL Y
ALGOL Y was the name given to a speculated successor for the ALGOL 60 programming language that incorporated some radical features that were rejected for ALGOL 68 and ALGOL X. ALGOL Y was intended to be a "radical reconstruction" of ALGOL. One such feature was the possibility to construct new proc mode's at run-time, which was criticized as the "ability to modify its own programs at run time" while, on the other hand, it would have brought ALGOL Y to the same level of expressiveness as LISP. "Initially the proposal for an update to Algol was Algol X, with Algol Y being the name reserved for the corresponding metalanguage.