Polish prefix notation is a method of writing a function with two arguments so that the operator is placed at the beginning of the function (+24). Conventional notation (also known as infix notation) fixes the operator between the two arguments (2+4). Nesting is allowed.

As an example, ((4*3)+(3/2)-1) may be written as -*43+/321. You will note the absence of parentheses.

The computer language LISP uses prefix-style notation.