[ummonk]

Those are perfectly reasonable names since they're standard convention in engineering and science. It's like using i, j, and k for index variables in iterators; the meaning is clear due to convention.

[whatch]

As someone who started learning Python with Data Science and ML courses and tutorials I overused these short names for variables in my first web apps

[__s]

Modern practice is to avoid i/j/k. i for a loop is alright, but if you start nesting, start giving those names semantic tells