Interesting long-tail tool-for-thought https://leahneukirchen.org/blog/archive/2022/03/note-taking-in-emacs-with-howm.html This bit is particularly tantalizing:

There are two kinds of links supported by howm, namely goto and come-from (in a nod to INTERCAL). goto links are forward references and written like this:

>>> howm

Pressing return on this line when

howm-mode

is enabled will show a list of all occurences of the word

howm

in your notes directory.

In contrast, a come-from link is written like this:

<<< howm

And this will cause the word

howm

in any howm-mode buffer to be underlined and trigger a search where the buffer with

<<< howm

will appear first.