Quadrillion
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Quadrillion may mean either of the two numbers (see long and short scales for more detail):
- 1,000,000,000,000,000 (one thousand million million (or one billion million); 1015; SI prefix peta) - increasingly common meaning in English language usage
- 1,000,000,000,000,000,000,000,000 (1024; SI prefix yotta) - increasingly rare meaning in English language usage

