It’s often said of Emacs that it includes everything including the kitchen sink. Indeed, there’s even an Emacs logo reflecting this sensibility. I don’t know if it was ever an official logo but its use is widespread. Still, it would be easy to dismiss the notion as a bit of Emacs fanboy hyperbole.
Gopar has a short video that provides compelling evidence that Emacs does, indeed, include the kitchen sink and everything else. The video demonstrates two builtin functions. To say that they are obscure and little used would be an award winning understatement.
The first is a function that translates to and from Morse code. Just in case you want to know what “Emacs is amazing” looks in More code, Emacs has you covered:
./--/.-/-.-./... ../... .-/--/.-/--../../-./--.
The second functionality is to render text in the phonetic alphabet. I’m familiar with this from my pilot days, where it can increase clarity in radio communications, but didn’t expect to find it in Emacs core. If you want to know how to spell Emacs in the phonetic alphabet, here you go:
Echo-Mike-Alfa-Charlie-Sierra
Emacs calls this the “NATO alphabet”. I’ve never heard it called that before but whatever you call it, Emacs can render text into it and, of course, go in the other direction as well.
Again, these functions are builtin, not packages. They make the current agonizing over whether or not to add actually useful functionality to Emacs core look positively silly.