Trillion


A trillion is a number with two distinct definitions:
Originally, the United Kingdom used the long scale trillion but since 1974, official UK statistics have used the short scale. Since the 1950s, the short scale has been increasingly used in technical writing and journalism, although the long scale definition still has some limited usage.
American English has always used the short scale definition.
Other countries use the word trillion to denote either the long scale or short scale trillion. For details, see Long and short scales#Current usage.