Tera

From Wikipedia, the free encyclopedia.

Tera (symbol: T) is a prefix in the SI system of units denoting 10¹², or 1 000 000 000 000.

• TERA is the Topfree Equal Rights Association.
• tera is Tera (Australia).

Confirmed in 1960, it comes from the Greek τέρας, meaning monster.

In computer science tera can sometimes mean 1 099 511 627 776 (2⁴⁰), instead of 1 000 000 000 000 especially when used to prefix the byte, giving a terabyte. To avoid this ambiguity, the term tebibyte has been introduced for 2⁴⁰ bytes, but this is not yet widely used.

SI prefixes

10n	Prefix	Symbol	Short scale	Long scale	Decimal Equivalent
1024	yotta	Y	Septillion	Quadrillion	1 000 000 000 000 000 000 000 000
1021	zetta	Z	Sextillion	Trilliard (thousand trillion)	1 000 000 000 000 000 000 000
1018	exa	E	Quintillion	Trillion	1 000 000 000 000 000 000
1015	peta	P	Quadrillion	Billiard (thousand billion)	1 000 000 000 000 000
1012	tera	T	Trillion	Billion	1 000 000 000 000
109	giga	G	Billion	Milliard (thousand million)	1 000 000 000
106	mega	M	Million		1 000 000
103	kilo	k	Thousand		1 000
102	hecto	h	Hundred		100
101	deca, deka	da	Ten		10
100	none	none	One		1
10−1	deci	d	Tenth		0.1
10−2	centi	c	Hundredth		0.01
10−3	milli	m	Thousandth		0.001
10−6	micro	�	Millionth		0.000 001
10−9	nano	n	Billionth	Milliardth	0.000 000 001
10−12	pico	p	Trillionth	Billionth	0.000 000 000 001
10−15	femto	f	Quadrillionth	Billiardth	0.000 000 000 000 001
10−18	atto	a	Quintillionth	Trillionth	0.000 000 000 000 000 001
10−21	zepto	z	Sextillionth	Trilliardth	0.000 000 000 000 000 000 001
10−24	yocto	y	Septillionth	Quadrillionth	0.000 000 000 000 000 000 000 001

See also

• SI prefix
• Binary prefix
• all pages from Teraca:Tera

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