The Greek letter **μ** (mu) arose from the ancient Phoenician letter 𐤌 (mēm) which, in turn, was derived from the Egyptian hieroglyph for water.

The lower-case μ has many uses in maths, engineering and sciences, for example:

- in coordination chemistry: μ-, a prefix for a bridging ligand
- in electromagnetism:
- the magnetic moment 𝛍
- the permeability
*µ*, measured in henries per meter (H·m^{−1}); - the vacuum permeability or magnetic constant
*µ*_{0}, which has the exact value of 4*π*×10^{−7}H·m^{−1}

- in fluid mechanics: dynamic viscosity
- in mathematics: the Möbius function
*μ*(*n*) - in maths and physics: µ (micro-), a unit prefix in the metric system for 10
^{−6}(one millionth) - in particle physics: muon μ
^{−}and antimuuon μ^{+}(formerly called μ-mesons) - in pharmacology: μ-opioid receptor (MOR)
- in physics: the coefficient of friction
- in physics: the electrical_mobility of a charged particle
- in thermodynamics: chemical potential aka partial molar free energy
*μ*_{i}

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