Billion may mean:

Numbers

• 1,000,000,000 (one thousand million; 10⁹), used by most English-speaking countries (American and usual modern British meaning)
• 1,000,000,000,000 (one million million; 10¹²), used by most other countries outside Asia (older British meaning).

The International System of Units offers ways to express such numbers in a more unambigous way. One thousand million (1,000,000,000) is the natural number following 999,999,999 and preceding 1,000,000,001. ... This list compares various sizes of positive numbers, including counts of things, dimensionless numbers and probabilities. ... Cover of brochure The International System of Units. ...

 International System of Units 

For the history of these two discrepant meanings, see long and short scales Cover of brochure The International System of Units. ... Short scale is the English translation of the French term échelle courte, which designates a system of numeric names in which the word billion means a thousand millions. ...

Commerce

• Billion (company) a modem manufacturer

Billion Electric Pty Ltd is a Taiwanese network hardware manufacturer and distributer. ...

References

• AskOxford: How many is a billion?.

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