Information about Zepto

An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol) to form a decimal multiple or submultiple.
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Si, si, or SI may refer to (all SI unless otherwise stated):

In language:

• One of two Italian words:
• sì (accented) for "yes"
• si

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units of measurement have played a crucial role in human endeavour from early ages up to this day. Disparate systems of measurement used to be very common. Now there is a global standard, the International System (SI) of units, the modern form of the metric system.
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19th century - 20th century - 21st century
1960s  1970s  1980s  - 1990s -  2000s  2010s  2020s
1988 1989 1990 - 1991 - 1992 1993 1994

Year 1991 (MCMXCI
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Motto
Liberté, Égalité, Fraternité
"Liberty, Equality, Fraternity"
Anthem
"La Marseillaise"


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Latin}}} 
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol) to form a decimal multiple or submultiple.
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The long and short scales are two different numerical systems used throughout the world:

Short scale is the English translation of the French term échelle courte.

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The long and short scales are two different numerical systems used throughout the world:

Short scale is the English translation of the French term échelle courte.

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decimal (base ten or occasionally denary) numeral system has ten as its base. It is the most widely used numeral system, perhaps because humans have four fingers and a thumb on each hand, giving a total of ten digits over both hands.
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yotta- (symbol Y) is an SI prefix in the SI (system of units) denoting 10²⁴ or 1 000 000 000 000 000 000 000 000.

Adopted in 1991, it comes from the Greek ὀκτώ (októ), meaning
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Quadrillion may mean either of the two numbers (see long and short scales for more detail):

• 1,000,000,000,000,000 (one thousand million million; ; SI prefix peta) - increasingly common meaning in English language usage.

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zetta- (symbol Z) is an SI prefix in the SI (system of units) denoting 10²¹ or 1 000 000 000 000 000 000 000.

Adopted in 1991, it comes from the Latin septem, meaning seven, because it is equal to 1000⁷.
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exa- (symbol E) is a prefix in the SI system of units denoting 10¹⁸ or 1 000 000 000 000 000 000.

Adopted in 1991, it comes from the Greek ἕξ, meaning six (like hexa- ), because it is equal to 1000⁶.
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Trillion may mean:

Numbers

Either of the two numbers (see long and short scales for more detail):

• 1,000,000,000,000 (one million million; ; SI prefix tera) - increasingly common meaning in English language usage.

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peta- (symbol: P) is a prefix in the SI (system of units) denoting 10¹⁵, or 1 000 000 000 000 000. For example:

1 petametre = 10¹⁵ metres

1 petasecond = 10¹⁵ seconds
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Quadrillion may mean either of the two numbers (see long and short scales for more detail):

• 1,000,000,000,000,000 (one thousand million million; ; SI prefix peta) - increasingly common meaning in English language usage.

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

Confirmed in 1960, it comes from the Greek τέρας, meaning monster.
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Trillion may mean:

Numbers

Either of the two numbers (see long and short scales for more detail):

• 1,000,000,000,000 (one million million; ; SI prefix tera) - increasingly common meaning in English language usage.

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Billion may mean:

Numbers

Either of two numbers (see long and short scales for more detail):

• 1,000,000,000 (one thousand million; ; SI prefix giga) - increasingly common meaning in English-language usage

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Giga- (symbol: G) is a prefix in the SI system of units denoting 10⁹, or 1,000,000,000 (1 billion). The Oxford English Dictionary reports the earliest written use of giga- in this sense to be in the Reports of the IUPAC 14th Conference in 1947: "The
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Billion may mean:

Numbers

Either of two numbers (see long and short scales for more detail):

• 1,000,000,000 (one thousand million; ; SI prefix giga) - increasingly common meaning in English-language usage

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Milliard is a French-derived word meaning the number 1,000,000,000 (10⁹; one thousand million; SI prefix giga). It is not used in American English and is rare in other forms of English - the preferred term being 'thousand million'.
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Mega- (symbol M) is an SI prefix in the SI system of units denoting a factor of 10⁶, 1,000,000 (one million).

For example, 1 MW (megawatt) = 1,000,000 watts = 1,000 kilowatts.
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million (1,000,000), or one thousand thousand, is the natural number following 999,999 and preceding 1,000,001.

In scientific notation, it is written as 10^6[1]
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