A billionaire, in countries that use the short scale number naming system, is a person who has a net worth of at least one billion (1,000,000,000) units of a given currency, usually the United States dollar, the euro, or the pound sterling. Forbes magazine updates a complete global list of known U.S. dollar billionaires every year.
Read more about Billionaire: Current U.S. Dollar Billionaires, Long Scale Billionaires/short Scale Trillionaires, Statistics