How do you indicate an example?

Question

In English when you want to show an example of a response without writing the actual word you can often substitute a letter, sometimes "A", "B", or "X", in its place. For example:

She argued that X caused Y to happen. Tom likes to eat A and B together.

Is there a way to do this in Spanish? Is it the same as in English?

Answer 1

We only use A, B, X, Y because they are common variable letters used for unknowns in mathematics. I would suppose that the same happens in Spanish.

Also like in English Esto and Eso could be used.