Re: Standard form - SI standards
SI prefixes with:short scale / long scale names
10^6 - mega - Million / Million
10^9 - giga - Billion / Milliard
10-12 - tera - Trillion / Billion
10^15 - peta - Quadrillion / Billiard
10^18 - exa - Quintillion / Trillion
10^21 - xetta - Sextillion / Trilliard
10^24 - yotta - Septillion / Quadrillion
Note that the short form bears little relation to the power of 10, e.g. Septillion is 10^24 but 24 isn't 7 times any integer, whereas 24 is 6 (million) times 4 - hence Quadrillion. Simples.
However the short form is more universally used as the world isn't run by techies but by Marketing and PR (e.g. D.Cameron).
This also explains a lot about the world today...