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Different schemes have different id numbers of different lengths.
to determine whether or not you pay tax on certain items..mainly i guess you could say for tax exemption.
Credit card ID numbers have three (Discover, Visa, MasterCard) or four (American Express) digits.
Unless if you are referring to calendar years, the number zero, decimal points, or other pieces of information that relies on 0 as a digit (e.g. phone numbers, ID numbers, or serial numbers), then most instances the number zero is omitted.