eli5: What do you do when you run out of variables?

Question

you refer to variables like “x” “y” “z” so on so forth, but what happens when you run out? Do you go capital do you use a special symbol or something?

In: Mathematics

Answer 1

You can literally use anything. Letters, symbols, Greek letters, Asian characters, doodles, words, etc etc etc. They’re just placeholders.

The equation E=mc^2 can just as accurately be written Kumquat=$£^2 as long as all parties agree what the terms mean