# Kappa

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Kappa

Kappa (uppercase &Kappa;, lowercase &kappa; or Unicode|ϰ; _el. Κάππα) is the 10th letter of the Greek alphabet, used to represent the voiceless velar stop, or "k", sound in Ancient and Modern Greek. In the system of Greek numerals it has a value of 20. It was derived from the Phoenician letter Kaph. Letters that arose from kappa include the Roman K and Cyrillic Ka.

Greek proper names and placenames containing kappa are often written in English with "c" due to contemporary rendering into the Latin alphabet by ancient Romans. However, modern transliteration of the Greek language invariably use the letter "k". Compare "Κυνοσκεφαλαι", "Cynoscephalae" (ancient placename); "κυνος κεφαλαι", "kunos kephalai" (phrase), meaning "dog's heads".In mathematics, the kappa curve is named after this letter; the tangents of this curve were first calculated by Barrow (17th Century).

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In graph theory, the connectivity of a graph is given by κ.

In differential geometry, the curvature of a curve is given by κ.

In physics, the torsional constant of an oscillator is given by κ.

In chemistry, the compressibility of a compound is given by κ.

In physics, the dielectric constant of a capacitor is also given by κ.

In physics, the Einstein constant of gravitation

In psychology and psychiatry, kappa represents a measure of diagnostic reliability.

In biology, kappa and kappa prime are important nucleotide motifs for a tertiary interaction of group II introns.

In biology, kappa designates a subtype of an antibody component.

In pharmacology, kappa represents a type of opioid receptors.

Kappa statistics such as Cohen's kappa and Fleiss' kappa are methods for calculating interannotator agreement.

Upper-case letter Κ is used as a symbol for:
*In textual criticism, the Byzantine text-type (from Κοινη, "Koine", the common text).

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• kappa — kappa …   Dictionnaire des rimes

• Kappa — BasicNet SpA Тип Частная компания Год основания 1916 Расположение …   Википедия

• kappa — [ kapa ] n. m. inv. • 1690; cappa 1611; mot gr. ♦ Dixième lettre de l alphabet grec (K, κ). ⊗ HOM. C. A. P. A., cappa. ● kappa nom masculin Dixième lettre de l alphabet grec (Κ, κ), dérivée du signe phénicien kaph. ● kappa (homonymes) nom… …   Encyclopédie Universelle

• kappa — KÁPPA s.m. A zecea literă a alfabetului grecesc, corespunzând sunetului k. [scris k] (din fr. kappa < gr. < orig. semit.; cf. ebr. kaph) [def. MDN] Trimis de tavi, 13.07.2004. Sursa: DOOM ﻿ káppa s. m.; scris k Trimis de siveco, 10.08.2004 …   Dicționar Român

• Kappa — Kappa, IL U.S. village in Illinois Population (2000): 170 Housing Units (2000): 67 Land area (2000): 0.227533 sq. miles (0.589307 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.227533 sq. miles (0.589307 sq.… …   StarDict's U.S. Gazetteer Places

• Kappa, IL — U.S. village in Illinois Population (2000): 170 Housing Units (2000): 67 Land area (2000): 0.227533 sq. miles (0.589307 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.227533 sq. miles (0.589307 sq. km) FIPS… …   StarDict's U.S. Gazetteer Places

• kappa? — *kappa? germ., Femininum: nhd. Kappe, Hut ( Maskulinum); ne. cap, hat; Rekontruktionsbasis: ae., afries., as., ahd.; Etymologie: lat. cappa, Femininu …   Germanisches Wörterbuch

• Kappa — (gr.), griechischer Name des Buchstaben K …   Pierer's Universal-Lexikon

• kappa — Décima letra del alfabeto griego. Diccionario Mosby Medicina, Enfermería y Ciencias de la Salud, Ediciones Hancourt, S.A. 1999 …   Diccionario médico

• kappa — Esta es la grafía recomendada para el nombre de la décima letra del alfabeto griego, que corresponde a la k en el latino. Se desaconseja la variante ⊕ cappa, poco usada y alejada de la transcripción del étimo griego …   Diccionario panhispánico de dudas