LYaPAS (Russian: ЛЯПАС, short for "Logical Language for the Representation of Synthesis Algorithms") is a programming language created in the Soviet Union in 1964 by Arkady D.Zakrevskij of the Laboratory of System Programming and Logical Synthesis of the BSSR Academy of Sciences.
LYaPAS is an extension to APL, and was initially designed to program the URAL-1 computer. An interesting feature of the language is its use of octal numbers.
A further refinement of LYaPAS is LYaPAS-M.