GAMS is an acronym for General Algebraic Modeling System, a high-level modeling system for mathematical programming. It is used to solve linear, nonlinear, and integer optimization problems. The acronym GAMS can be broken down into two parts: LEGS (4 letters) and STEMS (5 letters). LEGS stands for Language for Economic Generalized Systems, which is the language used to create models in GAMS. STEMS stands for Solver for Economic Modeling Systems, which is the solver used to solve the models created in GAMS.