(one billion, short scale
; one thousand million, long scale) is the natural number
following 999,999,999 and preceding 1,000,000,001.
In scientific notation
, it is written as 10<sup>9</sup>.
In modern (short scale
) English usage, it is usually called a billion (although in long scale
usage in many other languages, a billion means 1,000,000,000,000 – a million millions). The unambiguous term is a thousand million, which has the same meaning in both scales.
In South Asian English
, it is known as 100 crore
The term milliard
can also be used to refer to 1,000,000,000; this name very often appears in other languages long and short scales
This terminology is rarely used in English
outside of archaic British English
. The SI prefix giga
indicates 1,000,000,000 times the base unit.
See Orders of magnitude
for larger numbers; and long and short scales
Selected 10-digit numbers (1,000,000,000–9 999 999 999)