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Koppa or qoppa (Ϙ, ϙ; as a modern numeral sign: ϟ) is a letter that was used in early forms of the Greek alphabet, derived from Phoenician qoph (𐤒).It was originally used to denote the /k/ sound, but dropped out of use as an alphabetic character and replaced by Kappa (Κ).
the Kappa number, indicating lignin content in pulp; represents: the Von Kármán constant, describing the velocity profile of turbulent flow; the kappa curve, a two-dimensional algebraic curve; the condition number of a matrix in numerical analysis; the connectivity of a graph in graph theory; curvature
Variant kappa Greek word καί written with a handwritten variant of kappa, from the Byzantine period. Kappa (/ ˈ k æ p ə /; [1] uppercase Κ, lowercase κ or cursive ϰ; Greek: κάππα, káppa) is the tenth letter of the Greek alphabet, representing the voiceless velar plosive IPA: sound in Ancient and Modern Greek.
The symbol ϑ ("script theta") is a cursive form of theta (θ), frequent in handwriting, and used with a specialized meaning as a technical symbol. The symbol ϰ ("kappa symbol") is a cursive form of kappa (κ), used as a technical symbol.
3. Between two groups, may mean that the first one is a proper subgroup of the second one. > (greater-than sign) 1. Strict inequality between two numbers; means and is read as "greater than". 2. Commonly used for denoting any strict order. 3. Between two groups, may mean that the second one is a proper subgroup of the first one. ≤ 1.
Early Greek print, from a 1566 edition of Aristotle. The sample shows the -os ligature in the middle of the second line (in the word μέθοδος), the kai ligature below it in the third line, and the -ou-ligature right below that in the fourth line, along many others. 18th-century typeface sample by William Caslon, showing a greatly reduced set of ligatures (-ου-in "τοῦ", end of first ...
In Russian, the letter Ka represents the plain voiceless velar plosive /k/ or the palatalized one /kʲ/; for example, the word короткий ("short") contains both the kinds: [kɐˈrotkʲɪj]. The palatalized variant is pronounced when the following letter in the word is ь, е, ё, и, ю, or я.
After Greek words were taken into Latin, the kappa was transliterated as a C. Loanwords from other alphabets with the sound /k/ were also transliterated with C. Hence, the Romance languages generally use C, in imitating Classical Latin's practice, and have K only in later loanwords from other language groups.