Billion

A billion is equal to 109 = 1,0003 = 1,000,000,000.Conway and Guy. The Book of Numbers. Copernicus. 1995. ISBN 978-0387979939 p.16Billion at Wolfram MathWorld Like a million, a billion is often used as an exaggeration to mean an indefinitely large number.
In the long scale, 109 is called milliard, whereas "billion" refers to 1012 = 1,000,000,000,000. These definitions are no longer used in English-speaking countries, but there are equivalents in other languages such as French and German.
To prevent confusion with the similar sounding "million", or with 1012, even some languages, such as , which otherwise use short scale, use the term "milliard" (Turkish: "milyar") for 109.
== Alternative names ==
Other names for this number are gillion (from giga-, in Rowlett's Greek-based system) and tretillionAarex Tiaokhiao's illion numbers (by Aarex Tiaokhiao).
Wikia user NumLynx gave the name trisand for this number's short scale value. They also gave the name ennaplex, coined in analogy to ennalogue. 
Nirvana Supermind calls this number six-ex-grand zeroogol , and it's equal to Q<10,five-ex-grand zeroogol> in Quick array notationNumbers from quick array notation.
Aarex Tiaokhiao calls this number noovol, 9-noogolPart 1 (LAN) - Aarex Googology, or goonaolheptault, and it's equal to a(10,100,0)x[7] in Aarex's Array Notation.AAN Numbers - P1 - Aarex Googology
Username5243 calls this number niloogolsextiplex or goonvol, and it's equal to 10[1]9 in Username5243's Array Notation.Part 1 - My Large Numbers
BlankEntity calls this number Noogil.BlankEntity's Googology Site
This number is called one arab in the Indian number system.
== Examples ==
* One billion seconds is roughly 31.7 years, and billion minutes is nearly two millenia. 12:32 AM, April 29, 1902 marked exactly one billion minutes from 1 A.D. 
* The internet contains more than a billion webpages.
* It would take 951 years for a faucet running on full power to waste a billion gallons of water.
* , a hit single/music video by Korean rapper PSY, became the first video to reach 1 billion views in December 2012. It has nearly 3 billion views, and it held the former record of the video with the most views. As of August 2024, the current record is Baby Shark Dance with more than 14.73 billion views.Top 10 Most-viewed Videos On YouTube In 2024 - Forbes India
* The world population is around 8 billion.
* The SI prefix giga- multiplies by one billion.
* You could make 1,000 sand castles each containing a million grains of sand with 1 billion grains of sand.
* The oldest billionaire of all time was Walter Haefner who died at the age of 101.
*At about 5 billion years, the Sun will become a red giant.
*The Earth formed about 4.6 billion years ago.
== Currency-related use ==
Some currencies, such as the , the and the third , had banknotes with this number in the denomination.
It was also the prize for correctly answering all fifteen questions in the Italian game show in .
Furthermore, it was also the prize for correctly answering the first six questions in the Turkish game show in first .
== Approximations ==
For short scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^9\) 	\(1\times10^9\)
Arrow notation 	\(10\uparrow9\) 	\(10\uparrow9\)
Steinhaus-Moser Notation 	9[3] 	10[3]
Copy notation 	9[9] 	10[5]
Taro's multivariable Ackermann function	A(3,26) 	A(3,27)
Pound-Star Notation 	#*(1,2,3)*3 	#*(2,2,3)*3
BEAF 	{10,9} 	{10,9}
Hyper-L Notation 	L(9) 	L(9)
Hyper-E notation 	E9 	E9
Bashicu matrix system 	(0)[31622] 	(0)[31623]
Hyperfactorial array notation 	12! 	13!
Fast-growing hierarchy 	\(f_2(25)\) 	\(f_2(26)\)
Hardy hierarchy 	\(H_{\omega^2}(25)\)	\(H_{\omega^2}(26)\)
Slow-growing hierarchy 	\(g_{\omega^9}(10)\)	\(g_{\omega^9}(10)\)
For long scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{12}\) 	\(1\times10^{12}\)
Arrow notation 	\(10\uparrow12\) 	\(10\uparrow12\)
Steinhaus-Moser Notation 	11[3] 	12[3]
Copy notation 	9[12] 	1[13]
Taro's multivariable Ackermann function	A(3,36) 	A(3,37)
Pound-Star Notation 	#*(4,2,3)*4 	#*(1,2)*8
BEAF 	{10,12} 	{10,12}
Hyper-L Notation 	L(12) 	L(12)
Hyper-E notation 	E12 	E12
Bashicu matrix system 	(0)(0)[1000] 	(0)(0)[1000]
Hyperfactorial array notation 	14! 	15!
Fast-growing hierarchy 	\(f_2(34)\) 	\(f_2(35)\)
Hardy hierarchy 	\(H_{\omega^2}(34)\) 	\(H_{\omega^2}(35)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega+2}}(10)\)	\(g_{\omega^{\omega+2}}(10)\)
== Sources ==
== See also ==
*Byllion
de:Billion
nl:Biljoen
cs:Bilión
pl:Billion
Category:Numbers
Category:Banknote denominations
Category:Base Illion
Category:Class 2
Category:Game show prizes
Category:Illion
Category:Numbers with 7 to 29 digits
Category:Tier 1 -illion numbers
Category:Googol Regiment
Category:Powers of 10
Category:Numbers with peer-reviewed source
fr:Billion