A simple (but not all-encompassing) definition of a (real) number is "A symbol that represents a quantity". This is almost always what they are used for. I can't think of any exceptions right now beyond when they are just used as symbols ( in codes for example ). Other kinds of number generally are conceptual ( complex/imaginary for example, seeing as we can't visualize them beyond mathematical diagrams ), constants (e for example) or ratios ( pi is a good example, because due to General Relativity it is not a constant ).
Hope this helps in some way.
Hope this helps in some way.
If more of us valued food and cheer and song above hoarded gold, it would be a merrier world. - J.R.R Tolkien