Binary numbers are a base 2 numeral system.
A binary number is a number expressed in the base-2 numeral system, which uses only two symbols: 0 and 1. Each digit is referred to as a bit. Because of its straightforward implementation in digital electronic circuitry using logic gates, the binary system is used by almost all modern computers and computer-based devices.
In Reverse Polish Notation, the operators follow their operands.
In RPN calculators, no equals key is required to force computation to occur. To learn more about a programming language using RPN, see Forth.