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Standard mathematical operators, functions and constants, for example exp(pi*i/2) (see Mathematical Functions).

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Built-in functions and physical constants which are always available (see Physical Constants).

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Symbolic operators, for example d(x^2,x) to express differentiation and sum(a^2,a,1,5) to express a sum (see Built-In Operators).

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Unit syntax brackets, for example 3[MHz] (see Using Units).

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Model parameters, which may be built-in or user-defined (see Parameters).

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Built-in variables, functions, and operators autogenerated for the specific model configuration (see Variables).