![Hewlett Packard HP-33E programmable scientific calculator from 1978, which uses Reverse Polish Notation Stock Photo - Alamy Hewlett Packard HP-33E programmable scientific calculator from 1978, which uses Reverse Polish Notation Stock Photo - Alamy](https://c8.alamy.com/comp/D2G35C/hewlett-packard-hp-33e-programmable-scientific-calculator-from-1978-D2G35C.jpg)
Hewlett Packard HP-33E programmable scientific calculator from 1978, which uses Reverse Polish Notation Stock Photo - Alamy
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Patrick Goh on Twitter: "#RPN #stackbase example Reverse Polish Notation https://t.co/FdluajOsvA https://t.co/Yr4geEwWiJ" / Twitter
![Reverse Polish Notation (AKA Postfix Notation) Calculator for Windows 7 - Software Recommendations Stack Exchange Reverse Polish Notation (AKA Postfix Notation) Calculator for Windows 7 - Software Recommendations Stack Exchange](https://i.stack.imgur.com/onZsW.png)