infix: old Egyptians/Assirs some thousands year before

prefix: Jan Łukasiewicz (Polish Notation)

postfix: Burks, Warren, and Wright (Reverse Polish Notation)

polish notation is also known as prefix notation ,prefix notation is form of notation for logic ,arithmetic or algebra ,it distinguishing feature is that of it place operator to the left of their operands

First, here are the keystrokes in algebraic notation:

2 x 3 <enter>

Here is the same thing in RPN:

2 <enter> 3 x

RPN is supposed to be easier to program on a handheld calculator.

Reverse Polish Notation (RPN) is a system where expressions are evaluated from left to right, with no precedence, with operators stated following the operands. A typical RPN expression might be ab+c*, which in infix means (a+b)*c. (Infix is our "standard" system which we use when writing programs) Note that the infix expression required parenthesis to override operator precedence, but the RPN expression did not. If you said in infix a+b*c, the RPN equivalent would be abc*+. The value of RPN is that it is easy to build a stack machine that processes the expression. Each time you encounter an operand, you push it on the stack. Each time you encounter an operator, you process it, replacing the top two elements of the stack with the result (for binary operators), or replacing the top element of the stack with the result (for unary operators). RPN is often used in compiler design.

You have it in reverse. Scientific notation is useful for measuring stars.