RPN. In the example 3 4 -, first the 3 is put onto the stack, then the 4; the 4 is now on top and the 3 below it. The subtraction operator removes the top two items from the stack, performs 3 - 4, and puts the result of -1 onto the stack.

Common language in this context refers to items being pushed onto the stack when added and popped or removed from the stack when taken off.

The advantage of reverse Polish notation is that it removes the need for order of operations and parentheses that are required by infix notation

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