Apparently Fedora has a Brainfuck interpreter in its repository.
Accidentally typed “bf” and it offered to install the package.
What is Brainfuck, you ask? “Code that was designed to hurt” is a good description. https://theoutline.com/post/825/brainfuck-coding-languages
The entire syntax is made up of +,-,<,>,[,],. and ,
Ah, this looks like the description I saw way back when