Micro Symbol
About Micro Symbol
µ is the micro symbol, derived from the Greek letter mu, representing the prefix micro- meaning one millionth (10⁻⁶) in the metric system. The micro symbol µ is fundamental in science and engineering, denoting microscopic measurements from micrometers to microfarads, and frequently appears alongside the ohm symbol Ω in electrical measurements.
The micro symbol µ resembles a lowercase u with a descender tail on the left. As a Unicode character, the micro symbol holds codepoint U+00B5 within the Latin-1 Supplement block. The micro symbol is officially adopted as the micro- prefix by the International System of Units (SI), making it one of the most widely used scientific symbols worldwide.
【Historical Origin】 The micro symbol comes from the Greek letter mu (μ), the 12th letter of the Greek alphabet. It was officially adopted as the micro- prefix by the SI system in 1960, becoming standard notation in scientific measurement. The micro symbol also relates to the sigma symbol σ in statistical contexts involving micro-scale populations.
【Modern Applications】 Today the micro symbol is indispensable in physics, chemistry, biology, and engineering. It combines with the ohm symbol Ω to form µΩ (micro-ohm) for precision resistance, appears in µm (micrometer), µF (microfarad), and µg (microgram). The micro symbol also features in infinity symbol concepts like microscopic infinity in fractal geometry.
How to Type Micro Symbol
Windows Input
Method 1: Hold Alt and type 0181 on the numeric keypad; Method 2: Type wei or mu in Chinese input method; Method 3: Use Character Map to copy the micro symbol.
Mac Input
Method 1: Press Option + M to directly type the micro symbol µ; Method 2: Press Control + Command + Space and search "micro" or "mu"; Method 3: Use the Greek keyboard layout for the mu letter.
HTML/CSS Input
HTML: µ or µ or µ; CSS: content: "\00B5";
LaTeX Input
Use \mu to type the micro symbol µ in LaTeX math mode. For text mode SI units, use the \textmu from textcomp or \micro from the siunitx package for proper micro symbol rendering.
Micro Symbol FAQ
What does the micro symbol µ mean in measurements?
The micro symbol µ means one millionth (10⁻⁶). For example, 1µm (micrometer) equals 0.000001 meters, 1µF equals 0.000001 farads, and 1µg equals 0.000001 grams. The micro symbol enables compact notation for extremely small quantities.
How is the micro symbol used with the ohm symbol?
The micro symbol combines with the ohm symbol Ω to form µΩ (micro-ohm), representing one millionth of an ohm. This pairing of the micro symbol and ohm symbol is essential in precision electrical resistance measurements for high-current applications.
Is the micro symbol the same as the lowercase Greek mu?
The micro symbol µ is essentially the lowercase Greek letter mu, though Unicode distinguishes them with different codepoints: U+00B5 for the micro symbol and U+03BC for Greek small letter mu. In practice, they appear identical in most fonts.
How does the micro symbol relate to the sigma symbol in statistics?
In statistics, the micro symbol appears in micro-level population parameters, contrasting with the sigma symbol σ for standard deviation at macro scales. The micro symbol and sigma symbol together span the range from microscopic precision to macroscopic variability.