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'Billion' may mean:

Contents

Numbers

Commerce

Numbers

Either of two numbers (see 'long and short scales' for more detail):

★ 1,000,000,000 (one thousand million; $10^\{9\}$; SI prefix giga) - increasingly common meaning in English-language usage

★ 1,000,000,000,000 (one million million; $10^\{12\}$; SI prefix tera) - increasingly rare meaning in English-language usage; standard meaning in many other languages
For comparison purposes, a Million seconds is 11.5 days; a Billion (one thousand million) seconds is just under 32 years.

Commerce

★ Billion (company), a modem manufacturer