'zero' and '0' are the same label, for the digit 0. There is no advantage to re-defining it, in fact, it does the opposite. It's a good practice to define label

'zero' and '0' are the same label, for the digit 0. There is no advantage to re-defining it, in fact, it does the opposite. It's a good practice to define labels for magic numbers to promote more maintainable code through the DRY / single source of truth principle, document the magic number through the label name, and improve code archeology by enabling searching by label. These principles hold when the label given a clear and concise name--which is an art.