sod/command_reference at master · arp2600/sod · GitHub

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Binary Operators: drops the stack size by one
        +          Add
        -          Subtract
        *          Multiply
        /          Divide
        %          Modulo
        ^          Power

Unary Operators: changes the element on top of the stack
        sin        Sine
        cos        Cosine
        tan        Tan
        sinh       Inverse Sine function
        cosh       Inverse Cosine function
        tanh       Inverse tan function
        rnd        Round a number to closest integer
        sqrt       Square root a number
        !          Factorial of a number

dup                -                duplicate the top element
swp                -                swap the top two elements
dump               -                print out the stack
drop               -                decrements the head, dropping the top value in the stack (leaves the value in place)
catch              -                increment the head, catching a value previously dropped