Billion may mean:
Numbers
Either of two numbers (see long and short scales for more detail):
- 1,000,000,000 (one thousand million; 109; SI prefix giga) - increasingly common meaning in English-language usage
- 1,000,000,000,000 (one million million; 1012; SI prefix tera) - increasingly rare meaning in English-language usage; standard meaning in many other languages
Commerce
- Billion (company), a modem manufacturer
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