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Confirmed in 1960, it comes from the Greek μέγας, meaning great.
For example, 1 MW (megawatt) = 1 000 000 watts = 1 000 kilowatts.
In computingOriginally, the word computing was synonymous with counting and calculating, and a computer was a person who computes. Since the advent of the electronic computer, it has come to also mean the operation and usage of these machines, the electrical processe, mega can sometimes denote 1,048,576 (220) of information units (example: a megabyteA megabyte is a unit of measurement for computer storage, memory and information; while its exact definition varies, it is in theory equal to one million bytes. The symbol for megabyte is MB (note B for Byte, lowercase b would mean bit). Three definitions, a megaword), but can denote 1 000 000 (106) of other quantities, for example, transfer rates: 1 megabit/s = 1 000 000 bit/s.
The prefix mebi has been suggested as an alternative for 220 to avoid ambiguity, but is yet to be widely used.
| SI prefixes [ }|action=edit}} Edit }] | ||||
|---|---|---|---|---|
| (Sub)multiple | Prefix | Symbol | Short scale Name | Long scale Name |
| 1024 | yotta | Y | Septillion | Quadrillion |
| 1021 | zetta | Z | Sextillion | Thousand trillion (Trilliard) |
| 1018 | exa | E | Quintillion | Trillion |
| 1015 | peta | P | Quadrillion | Thousand billion ( Billiard) |
| 1012 | tera | T | Trillion | Billion |
| 109 | giga | G | Billion | Thousand million ( Milliard) |
| 106 | mega | M | Million | |
| 103 | kilo | k | Thousand | |
| 102 | hecto | h | Hundred | |
| 101 | deca | da | Ten | |
| 10-1 | deci | d | Tenth | |
| 10-2 | centi | c | Hundredth | |
| 10-3 | milli | m | Thousandth | |
| 10-6 | micro | µ | Millionth | |
| 10-9 | nano | n | Billionth | Milliardth |
| 10-12 | pico | p | Trillionth | Billionth |
| 10-15 | femto | f | Quadrillionth | Billiardth |
| 10-18 | atto | a | Quintillionth | Trillionth |
| 10-21 | zepto | z | Sextillionth | Trilliardth |
| 10-24 | yocto | y | Septillionth | Quadrillionth |