"In the US (and almost everywhere else) it's:<br><br>   10^3  -  Thousands<br>   10^6  -  Millions<br>   10^9  -  Billions<br>   10^12 - Trillions<br>   10^15 - Quadrillions<br>   10^18 - Quintillions<br>   10^21 - Sextillion<br>   10^24 - Septillions (this is the unit she was looking for--10^25 is 10's of septillions)<br>   10^27 - Octillions<br>   10^30 - Nonillions<br>   10^33 - Decillions<br>   10^36 - Undecillions<br>   10^39 - Duodecillions<br>   10^42 - Tredecillion<br>   10^45 - Quattuordecillion<br>    10^48 - Quindecillion<br>    10^51 - Sexdecillion<br>    10^54 - Septendecillion<br>    10^57 - Octodecillion<br>    10^60 - Novemdecillion<br>    10^63 - Vigintillion<br>    10^66 - Unvigintillion<br>    10^69 - Duovigintillion<br>    10^72- Trevigintillion<br>    10^75- Quattuorvigintillion<br>    10^78- Quinvigintillion<br>    10^81- Sexvigintillion<br>    10^84- Septenvigintillion<br>    10^87- Octavigintillion<br>    10^90- Novemvigintillion<br>    10^93- Trigintillion<br>    10^96- Untrigintillion<br>    10^99- Duotrigintillion<br>    10^102- Tretrigintillion<br>    ...<br>    10^303 - Centillion<br><br>Never mention the British system; it's inconsistent", rarely used, and only makes this more confusing than it needs to be.