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
Other characters
	Digamma		Stigma
	Heta		San
	Qoppa		Sampi
Greek diacritics

Nu (uppercase Ν, lowercase ν; also transcribed as Ny; modern Greek: Νι [ni] Ni), is the 13th letter of the Greek alphabet. In the system of Greek numerals it has a value of 50. Its Latin Alphabet equivalent is N, though the lowercase 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 sometimes written νι [ni]. In English, the name of the letter is pronounced /ˈnuː/ or /ˈnjuː/.

The lower-case letter ν is used as a symbol for:

• Degree of freedom in statistics
• The frequency of a wave in physics and other fields.
• Kinematic viscosity in fluid mechanics
• Poisson's ratio, the ratio of strains perpendicular with and parallel with an applied force.
• Any of three kinds of neutrino in particle physics.
• One of the Greeks in mathematical finance, known as "vega".
• The number of neutrons released per fission of an atom in nuclear physics.
• A DNA polymerase found in higher eukaryotes and implicated in Translesion Synthesis.
• Molecular vibrational mode, ν_x where x is the number of the vibration (a label)
• The stoichiometric coefficient
• The Greatest fixed point of a function, as commonly used in the μ-calculus
• The maximum conditioning possible for an unconditioned stimulus in the Rescorla-Wagner model

See also

• N ephelkystikon