[be-baw]

I remember in the mid-70’s being frustrated with HP calculators’ RPN-Reverse Polish notation.

However, it was a huge deal when HP came out with a calculator that didn’t lose it’s memory after it was turned off.

[ConservativeMind]

I can’t stand RPN calculators.

[ifinnegan]

The reverse Polish notation seemed kooky at first but its utility became soon apparent and was by far the most efficient way to use a calculator for scientific purposes.