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Numerical prefixes are not restricted to denoting integers. Some of the SI prefixes denote negative powers of 10, i.e. division by a multiple of 10 rather than multiplication by it. Several common-use numerical prefixes denote vulgar fractions. Words containing non-technical numerical prefixes are usually not hyphenated.
Micro (Greek letter μ, mu, non-italic) is a unit prefix in the metric system denoting a factor of 10 −6 (one millionth). [1] It comes from the Greek word μικρός (mikrós), meaning "small".
prefix SI symbol 10 0: 1: One: 10 −1: 100×10 −3: One Tenth: deci-d: 10 −2: 10×10 −3: One One-Hundredth: centi-c: 10 −3: 1×10 −3: One One-Thousandth: milli-m: 10 −6: 1×10 −6: One One-Millionth: micro-μ: 10 −9: 1×10 −9: One One-Billionth: One One-Milliardth: nano-n: 10 −12: 1×10 −12: One One-Trillionth: One One ...
As such, Richard J.C. Brown (who proposed the prefixes adopted for 10 ±27 and 10 ±30) has proposed a reintroduction of compound prefixes (e.g. kiloquetta-for 10 33) if a driver for prefixes at such scales ever materialises, with a restriction that the last prefix must always be quetta-or quecto-. This usage has not been approved by the BIPM ...
Prefix Symbol Factor Power tera T 1 000 000 000 000: 10 12: giga G 1 000 000 000: 10 9: mega M 1 000 000: 10 6: kilo k 1 000: 10 3: hecto h 100 10 2: deca da 10 10 1 (none) (none) 1 10 0: deci d 0.1 10 −1: centi c 0.01 10 −2: milli m 0.001 10 −3: micro μ 0.000 001: 10 −6: nano n 0.000 000 001: 10 −9: pico p 0.000 000 000 001: 10 −12
In this way, numbers up to 10 3·999+3 = 10 3000 (short scale) or 10 6·999 = 10 5994 (long scale) may be named. The choice of roots and the concatenation procedure is that of the standard dictionary numbers if n is 9 or smaller. For larger n (between 10 and 999), prefixes can be constructed based on a system described by Conway and Guy. [17]
The prefixes of the metric system precede a basic unit of measure to indicate a decadic multiple and fraction of a unit. Each prefix has a unique symbol that is added to the beginning of the unit symbol. Some of the prefixes date back to the introduction of the metric system in the 1790s, but new prefixes have been added, and some have been ...
Mega is a unit prefix in metric systems of units denoting a factor of one million (10 6 or 1 000 000). It has the unit symbol M . It was confirmed for use in the International System of Units (SI) in 1960.