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I've been thinking maybe this has nothing to do with pi the number and more to do with pie the dish.
So probably I'm wrong, but when googled for source/origin of pie I got result as Romans/Greeks/Greece? If the answer is Greeks the answer also coincides with the origin/root of the letter pi as a Greek letter and the country is also named Greece (6).
Having different meanings for the same word in different industries is one thing...
I've heard IT terms used differently in different IT companies.
Like there was this company where they used the term "front-end" for everything from code running in the browser to the IIS service that served the pages.
The back-end, for them, was everything that did not serve HTML pages.
To me, and other places I've worked, the front-end is just what's running in your browser, everything else is back-end.
Some people also use the term back-end to mean their database, while others don't include it and mention a database explicitly.
And those are just two words.
It's all just very confusing...