Reverse Polish Notation
| Field | Mathematics, Computer Science |
| Went Obsolete | An approximation of when the skill was made obsolete |
| Made Obsolete By | Infix Notation |
| Knowledge Assumed | Basic Mathematics |
| When useful | Calculations using Stacks or Recursion |
RPN is still used in Hewlett Packard programmable calculators, Forth programming and numerous on-screen calculation tools.
