# Nu (letter)

Greek alphabet :
| Αα | Alpha | Νν | Nu |
| Ββ | Beta | Ξξ | Xi |
| Γγ | Gamma | Οο | Omicron |
| Δδ | Delta | Ππ | Pi |
| Εε | Epsilon | Ρρ | Rho |
| Ζζ | Zeta | Σσς | Sigma |
| Ηη | Eta | Ττ | Tau |
| Θθ | Theta | Υυ | Upsilon |
| Ιι | Iota | Φφ | Phi |
| Κκ | Kappa | Χχ | Chi |
| Λλ | Lambda | Ψψ | Psi |
| Μμ | Mu | Ωω | Omega |
History :
| Ϝϝ | Digamma | Ͱͱ | Heta |
| Ϻϻ | San | Ϙϙ | Koppa |
| Ͷͷ | TsanDigamma | Ͳͳ | Sampi |
| Ϸϸ | Sho | | |
Diacritics and other symbols :
Diacritics
άὰᾶἀἁᾱᾰϊᾳσ̌
Ligatures
ȢȢϏϗϚϛ⳨☧
Numerals (Attic)
ϛ (6)ϟ (90)ϡ (900) :
Related topics :
Use as scientific symbols
Orthography
Romanization
Cyrillization :
Category :
vte :
Nu, or ny (/ˈnjuː/; uppercase Ν, lowercase ν; Greek: vι ni), is the thirteenth letter of the Greek alphabet, representing the voiced alveolar nasal IPA:. In the system of Greek numerals it has a value of 50. It is derived from the Phoenician nun . Its Latin equivalent is N, though the lowercase ($\nu$) resembles the Roman lowercase v.
The name of the letter is written νῦ in Ancient Greek and traditional Modern Greek polytonic orthography, while in Modern Greek it is written νι [ni].
Letters that arose from nu include Roman N and Cyrillic script En.

## Symbology

The lower-case letter ν is used as a symbol in many academic fields. Uppercase nu is not used, because it appears identical to Latin N.
* Mathematics:
** Degrees of freedom in statistics.
** The greatest fixed point of a function, as commonly used in the μ-calculus.
** Free names of a process, as used in the π-calculus.
** One of the Greeks in mathematical finance, known as "vega".
** The reciprocal of 1 plus the interest rate in finance.
** The p-adic valuation or p-adic order of a number.
* Physics:
** Kinematic viscosity in fluid mechanics.
** The frequency of a wave in physics and other fields; sometimes also spatial frequency; wavenumber
** The specific volume in thermodynamics.
** Poisson's ratio, the ratio of strains perpendicular with and parallel with an applied force.
** Any of three kinds of neutrino in particle physics.
** The number of neutrons released per fission of an atom in nuclear physics.
** Molecular vibrational mode, ν$_x$ where x is the number of the vibration (a label).
** The true anomaly, an angular parameter that defines the position of a body moving along an orbit (see orbital elements).
* Biology:
** A DNA polymerase found in higher eukaryotes and implicated in translesion synthesis.
* Chemistry:
** The stoichiometric coefficient.
* Psychology:
** The maximum conditioning possible for an unconditioned stimulus in the Rescorla-Wagner model.

## Unicode

Encodings of Greek Nu and Coptic Ni.
* U+039D Ν GREEK CAPITAL LETTER NU (&Nu;)
* U+03BD ν GREEK SMALL LETTER NU (&nu;) (\nu in TeX)
* U+2C9A Ⲛ COPTIC CAPITAL LETTER NI
* U+2C9B ⲛ COPTIC SMALL LETTER NI
* U+1D6B4 𝚴 MATHEMATICAL BOLD CAPITAL NU
* U+1D6CE 𝛎 MATHEMATICAL BOLD SMALL NU
* U+1D6EE 𝛮 MATHEMATICAL ITALIC CAPITAL NU
* U+1D708 𝜈 MATHEMATICAL ITALIC SMALL NU
* U+1D728 𝜨 MATHEMATICAL BOLD ITALIC CAPITAL NU
* U+1D742 𝝂 MATHEMATICAL BOLD ITALIC SMALL NU
* U+1D762 𝝢 MATHEMATICAL SANS-SERIF BOLD CAPITAL NU
* U+1D77C 𝝼 MATHEMATICAL SANS-SERIF BOLD SMALL NU
* U+1D79C 𝞜 MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL NU
* U+1D7B6 𝞶 MATHEMATICAL SANS-SERIF BOLD ITALIC SMALL NU
* ↑ The MATHEMATICAL symbols should only be use for math. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style.