[throwaway4good]

For a syntax in a spreadsheet you would want something that is short and familiar but you can certainly toy with idea.

I remember when the geeky engineers had their calculators in reverse Polish notation:

https://en.m.wikipedia.org/wiki/Reverse_Polish_notation

[taneq]

checks my top drawer What do you mean 'remember when'?! :P Now if only I could remember how to use the damn thing...

[Jtsummers]

Numbers, enter, numbers, operation. That's about it, nice and simple. Programming in RPL was a lot of fun, sadly my HP-48G was lost to water damage (lost a bunch of things from that leaky roof). I still have my 32SII from college when a class required non-programmable calculators. Of course, it is programmable but they didn't know that (and I didn't use it) but it was easier to slip that out and stick with RPN than get used to a TI scientific calculator again.

[kinghajj]

I unironically have an RPN calculator app on my phone. I find it easier to use than a regular calculator.