K as a measure of capacity (especially in computer memory) or number (especially of salary), meaning "one thousand" is an abbreviation of kilo.
List of SI prefixes
The International System of Units specifies twenty SI prefixes:
Prefix | Symbol | 1000m | 10n | Decimal | Short scale | Long scale | Since[1] |
---|---|---|---|---|---|---|---|
yotta | Y | 10008 | 1024 | 1000000000000000000000000 | Septillion | Quadrillion | 1991 |
zetta | Z | 10007 | 1021 | 1000000000000000000000 | Sextillion | Trilliard | 1991 |
exa | E | 10006 | 1018 | 1000000000000000000 | Quintillion | Trillion | 1975 |
peta | P | 10005 | 1015 | 1000000000000000 | Quadrillion | Billiard | 1975 |
tera | T | 10004 | 1012 | 1000000000000 | Trillion | Billion | 1960 |
giga | G | 10003 | 109 | 1000000000 | Billion | Milliard | 1960 |
mega | M | 10002 | 106 | 1000000 | Million | 1960 | |
kilo | k | 10001 | 103 | 1000 | Thousand | 1795 | |
hecto | h | 10002⁄3 | 102 | 100 | Hundred | 1795 | |
deca | da | 10001⁄3 | 101 | 10 | Ten | 1795 | |
10000 | 100 | 1 | One | ||||
deci | d | 1000−1⁄3 | 10−1 | 0.1 | Tenth | 1795 | |
centi | c | 1000−2⁄3 | 10−2 | 0.01 | Hundredth | 1795 | |
milli | m | 1000−1 | 10−3 | 0.001 | Thousandth | 1795 | |
micro | μ | 1000−2 | 10−6 | 0.000001 | Millionth | 1960[2] | |
nano | n | 1000−3 | 10−9 | 0.000000001 | Billionth | Milliardth | 1960 |
pico | p | 1000−4 | 10−12 | 0.000000000001 | Trillionth | Billionth | 1960 |
femto | f | 1000−5 | 10−15 | 0.000000000000001 | Quadrillionth | Billiardth | 1964 |
atto | a | 1000−6 | 10−18 | 0.000000000000000001 | Quintillionth | Trillionth | 1964 |
zepto | z | 1000−7 | 10−21 | 0.000000000000000000001 | Sextillionth | Trilliardth | 1991 |
yocto | y | 1000−8 | 10−24 | 0.000000000000000000000001 | Septillionth | Quadrillionth | 1991 |