Look up ?, ? in Wiktionary, the free dictionary.

Greek alphabet
?a Alpha	?? Nu
?ß Beta	?? Xi
G? Gamma	?? Omicron
?d Delta	?p Pi
?e Epsilon	?? Rho
?? Zeta	Ss? Sigma
?? Eta	?t Tau
T? Theta	?? Upsilon
?? Iota	Ff Phi
?? Kappa	?? Chi
?? Lambda	?? Psi
?µ Mu	O? Omega
Obsolete letters
Digamma	Qoppa
San	Sampi
Other characters
Stigma	Sho
Heta
Greek diacritics

Nu (uppercase ?, lowercase ?; Greek: ?? [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 letter, known as ?? in Ancient Greek is written ?? in traditional Modern Greek polytonic orthography while the letter in Modern Greek is sometimes written ?? [ni:]. In English, the name of the letter is pronounced /'nu?/ or /'nju?/.

The lower-case letter ? 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.
• Specific volume, the volume occupied by a unit of mass of a material.
• 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, ?_x where x is the number of the vibration (a label)

• The Greatest fixed point of a function, as commonly used in the µ-calculus

Once on the TV game show Jeopardy!, there was a category "Homophones", with the answer "Was acquainted with the 13th letter of the Greek alphabet". The question was "Knew Nu".^{[citation needed]}

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