Not necessarily.
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The numbers in the license plate differ from country or state in the way they are represented. for example in the UK, they represent the age identifiers and the local memory tags.
A coordinate graph is a graph of pairs of numbers that represent real-life situations.
The basic thing is that symbols that represent numbers can be manipulated in the same way as ordinary numbers.
Typically a number is used to represent the exact amount of things you are counting. Numbers in telephone numbers actually don't count anything and were just a convenient way to categorize lines.
There are lots of different ways. One is to represent them as points in space of two or more dimensions.