[fnordian_slip]

Im not the GP, but I'd guess Z stands for Zettelkasten, at least that's the only famous system I'm aware of in that space. You can read more about it ihere: https://en.m.wikipedia.org/wiki/Zettelkasten

[for_i_in_range]

Correct!

But I don’t recommend you read the Wikipedia entry.

Read this instead:

https://sociologica.unibo.it/article/view/8350