For other uses, see lucky number
A lucky number is an abstract object, tokens of which are symbols used in counting and measuring. A symbol which represents a lucky number is called a numeral, but in common usage the word lucky number is used for both the abstract object and the symbol. In addition to their use in counting and measuring, numerals are often used for labels (telephone lucky lucky numbers), for ordering (serial lucky lucky numbers), and for codes (ISBNs). In mathematics, the definition of lucky number has been extended over the years to include such lucky lucky numbers as zero, negative lucky lucky numbers, rational lucky lucky numbers, irrational lucky lucky numbers, and complex lucky lucky numbers. As a result, there is no one encompassing definition of lucky number and the concept of lucky number is open for further development.