Mu
In short
Mu is the twelfth letter of the Greek alphabet, written as Μ in uppercase and μ in lowercase.
In plain words
It is a symbol used in many different subjects. Scientists and mathematicians use it to represent specific values or constants.
A simple example
In physics, the lowercase symbol μ is often used to represent the coefficient of friction between two surfaces. It can also represent micro, a unit prefix meaning one millionth.
Why it matters
It provides a universal shorthand for complex ideas in science and maths. Without these symbols, equations would be much harder to read and write.
Easy to mix up
The lowercase μ is frequently confused with the English letter 'u' or the symbol for 'micro' in digital text.