Press alt + numeric in bash and you get (arg [numeric]) what is that?

Question

Press alt + numeric in bash and you get (arg [numeric]) what is that?

(This type of question is better suited for asking a human, instead of trying to \"guess\" for the

Answer 1

I know this has already an accepted answer however I did find some useful examples that also demonstrate additional uses aside from simple repeating of characters. The digit arguments can apply to all sorts of things. For example the sequence "Alt+3, Escape, Backspace" will delete backwards 3 words.