# Kappa facts for kids

Kids Encyclopedia Facts
 Quick facts for kidsGreek alphabet Other letters Αα Alpha Νν Nu Ββ Beta Ξξ Xi Γγ Gamma Οο Omicron Δδ Delta Ππ Pi Εε Epsilon Ρρ Rho Ζζ Zeta Σσ 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 Ϝϝ Digamma Ϟϟ Koppa Ϛϛ Stigma Ϡϡ Sampi Ͱͱ Heta Ϸϸ Sho Ϻϻ San

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).

In mathematics, the lowercase $\kappa$ is used to represent the curvature of a curve, while the uppercase Κ is used to represent an ordinal number which is also a cardinal number.