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Kappa (uppercase/lowercase Κ κ) is the letter of the Greek alphabet used to represent the "k" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 20. Letters that came from it include the Roman K and Cyrillic К.
The letter κ always stands for the sound "k" in Greek. It is customary to transliterate (re-write) κ as "c" in English, but this is somewhat problematic since c is pronounced as "s" before e, i and y (which does not happen in Greek).
- Thermal conductivity, represented by [math]\kappa[/math]
- "Greek/Hebrew/Latin-based Symbols in Mathematics" (in en-US). 2020-03-20. https://mathvault.ca/hub/higher-math/math-symbols/greek-hebrew-latin-symbols/.
- "Kappa Symbol in Greek Alphabet" (in en). https://www.greeksymbols.net/kappa-symbol.