Nu Symbol ν Copy and Paste — Meaning in Physics, Math & Engineering

Copy the Nu Symbol Here

The nu symbol ν is the 13th letter of the Greek alphabet and appears extensively in physics, mathematics, and engineering. Copy any variant below:

• ν — Lowercase nu (U+03BD)
• Ν — Uppercase Nu (U+039D)
• 𝛎 — Mathematical italic nu (U+1D6C6)
• 𝛮 — Mathematical bold Nu (U+1D6AE)

Highlight the symbol you need, copy it, and paste it anywhere. The lowercase ν is by far the most commonly used form, especially in scientific and engineering contexts.

What Does the Nu Symbol Mean?

Nu (pronounced "noo" or "nyoo") is the 13th letter of the Greek alphabet. In modern scientific notation, the lowercase ν carries several important meanings across different fields. The two most prominent uses are frequency in physics and kinematic viscosity in fluid mechanics.

Nu in Physics — Frequency

In physics, ν (nu) is the standard symbol for frequency — the number of complete wave cycles that pass a fixed point per unit of time. Frequency is measured in hertz (Hz), where 1 Hz equals one cycle per second.

The relationship between frequency (ν), wavelength (λ), and the speed of light (c) is one of the most famous equations in physics:

c = λν

This equation tells you that the speed of light equals the wavelength multiplied by the frequency. If you know any two of these values, you can calculate the third. This relationship is fundamental to optics, telecommunications, spectroscopy, and quantum mechanics.

You will see ν used for frequency in:

• Electromagnetic radiation: Visible light, radio waves, X-rays, and gamma rays are all described by their frequency ν
• Sound waves: The pitch of a sound corresponds to its frequency — higher ν means higher pitch
• Quantum mechanics: The energy of a photon is E = hν, where h is Planck's constant
• Spectroscopy: Absorption and emission spectra are characterized by specific frequencies

Nu in Fluid Mechanics — Kinematic Viscosity

In fluid dynamics, ν represents kinematic viscosity — the ratio of dynamic viscosity (μ) to fluid density (ρ). The formula is:

ν = μ / ρ

Kinematic viscosity describes a fluid's resistance to flow under the influence of gravity. It is measured in square meters per second (m²/s) or, more commonly, in centistokes (cSt). Water at 20°C has a kinematic viscosity of about 1.004 cSt, while honey is roughly 10,000 cSt.

Engineers use ν when designing pipelines, calculating flow rates, modeling air resistance, and simulating fluid behavior in everything from aircraft wings to blood vessels.

Nu in Mathematics

The nu symbol appears in several areas of mathematics:

• Degree of freedom: In statistics, ν often denotes the degrees of freedom in a distribution (such as the chi-squared distribution or Student's t-distribution)
• Special functions: The Bessel function of order ν, written as Jν(x), is a solution to Bessel's differential equation
• Number theory: ν can represent the p-adic valuation of a number
• String theory: ν appears as an index in string vibration modes

Nu in Engineering

• Stoichiometry: ν represents the stoichiometric coefficient in chemical reaction equations, indicating the molar ratio of reactants and products
• Structural engineering: ν is the standard symbol for Poisson's ratio, which describes how a material expands perpendicular to the direction it is compressed
• Telecommunications: ν is used in signal processing to denote carrier frequency
• Nuclear engineering: ν represents the average number of neutrons released per fission event

Nu vs Vee — How to Tell Them Apart

The lowercase nu (ν) looks very similar to the Latin letter "v" (vee). In most fonts, nu has a slightly different shape — the left stroke is often more curved, and the character may be slightly narrower. In handwritten equations and some typefaces, they can be nearly indistinguishable. Context is the key differentiator: if you see ν in a physics formula involving wavelength (λ) or the speed of light (c), it is almost certainly nu (frequency), not the letter v (velocity).

How to Type the Nu Symbol on Keyboard

Windows

• Alt + 110: Hold Alt, type 110 on the numeric keypad for ν (works in some applications)
• Alt + 0957: Hold Alt, type 0957 on the numeric keypad for ν
• Character Map: Press Windows + R, type "charmap", search "nu"
• Microsoft Word: Insert > Symbol > Greek and Coptic > Nu

Mac

• Character Viewer: Press Control + Command + Space, search "nu"
• Greek keyboard: Add Greek in Keyboard settings, then press "n" for ν or Shift+N for Ν

iPhone and iPad

iOS does not have a ν key on the standard keyboard. Copy ν from this page for the fastest result. Alternatively, add the Greek keyboard: Settings > General > Keyboard > Keyboards > Add New Keyboard > Greek. Press "n" to type ν.

Android

On Gboard, add the Greek keyboard (Settings > System > Languages & input > Gboard > Languages > Add keyboard > Greek) and press "n" to type ν. Or simply copy ν from this page and paste it.

HTML and Unicode Reference

• HTML entity: ν renders as ν
• HTML decimal: ν renders as ν
• HTML hex: ν renders as ν
• Uppercase: Ν renders as Ν
• Unicode: U+03BD (lowercase), U+039D (uppercase)
• LaTeX: \nu for ν, \Nu for Ν

Quick Reference

All nu symbols in one place for instant copying:

ν Ν

From the frequency of light to the viscosity of fluids, the nu symbol is one of the most important Greek letters in physics and engineering. Bookmark this page to copy ν whenever you need it.