Kilo-

kilokkilos1000
Kilo is a decimal unit prefix in the metric system denoting multiplication by one thousand (10 3 ).wikipedia
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Metric prefix

SI prefixunit prefixprefix
Kilo is a decimal unit prefix in the metric system denoting multiplication by one thousand (10 3 ).
The prefix kilo-, for example, may be added to gram to indicate multiplication by one thousand: one kilogram is equal to one thousand grams.

1000 (number)

thousand10001,000
Kilo is a decimal unit prefix in the metric system denoting multiplication by one thousand (10 3 ).

Kilometre

kmkilometerkilometers
The kilometre (SI symbol: km; or ), spelt kilometer in American English, is a unit of length in the metric system, equal to one thousand metres (kilo- being the SI prefix for 1000).

Kilobyte

KBkilobytesK
The International System of Units (SI) defines the prefix kilo as 1000 (10 3 ); per this definition, one kilobyte is 1000 bytes.

Kilobit

kbitkbkilobits
The prefix kilo- (symbol k) is defined in the International System of Units (SI) as a multiplier of 10 3 (1 thousand), and therefore,

JEDEC memory standards

KBJEDEC socket
JEDEC memory standards still permit this definition, but acknowledge the correct SI usage.
The specification contains definitions of the commonly used prefixes kilo, mega, and giga usually combined with the units byte and bit to designate multiples of the units.

Bit

bitsbinary digitbinary digits
The prefixes kilo (10 3 ) through yotta (10 24 ) increment by multiples of 1000, and the corresponding units are the kilobit (kbit) through the yottabit (Ybit).

Exponentiation

exponentpowerpowers
For example, the prefix kilo means

Byte

bytesBTB
While the numerical difference between the decimal and binary interpretations is relatively small for the prefixes kilo and mega, it grows to over 20% for prefix yotta.

Kibibyte

KiBKBkibibytes
Therefore, 1024 bytes are defined as one kibibyte (1 KiB).
The interpretation of kilobyte to denote 1024 bytes, conflicting with the SI definition of the prefix kilo (1000), used to be common.

Binary prefix

gibikibitebi
To address this conflict, a new set of binary prefixes has been introduced, which is based on powers of 2.

Metric system

metricmetric unitsmetric unit
Kilo is a decimal unit prefix in the metric system denoting multiplication by one thousand (10 3 ).

International System of Units

SISI unitsSI unit
It is used in the International System of Units, where it has the symbol k, in lower case.

Greek language

GreekAncient GreekModern Greek
The prefix kilo is derived from the Greek word χίλιοι (chilioi), meaning "thousand".

Antoine Lavoisier

LavoisierAntoine-Laurent LavoisierAntoine Laurent Lavoisier
It was originally adopted by Antoine Lavoisier's research group in 1795, and introduced into the metric system in France with its establishment in 1799.

Linguistic purism

purismpuristpuristic
In 19th century English it was sometimes spelled chilio, in line with a puristic opinion by Thomas Young.

Thomas Young (scientist)

Thomas YoungYoungYoung, Thomas
In 19th century English it was sometimes spelled chilio, in line with a puristic opinion by Thomas Young.