The Laning and Zierler system (sometimes called "George" by its users) was one of the first operating algebraic compilers, that is, a system capable of accepting mathematical formulae in algebraic notation and producing equivalent machine code (the term compiler had not yet been invented and the system was referred to as "an interpretive program"). It was implemented in 1954 for the MIT WHIRLWIND by J. Halcombe Laning and Neal Zierler. It is preceded by the UNIVAC A-2, IBM Speedcoding and a number of systems that were proposed but never implemented.