- a cardinal number represented in the U.S. by 1 followed by 24 zeros, and in Great Britain by 1 followed by 42 zeros.
- amounting to one septillion in number.
- (in Britain, France, and Germany) the number represented as one followed by 42 zeros (10 42)
- (in the US and Canada) the number represented as one followed by 24 zeros (10 24)
