Κκ

KAPPA

κάππα · [k]

The 10th letter of the Greek alphabet.

MATHEMATICS

  • Curvature κ in geometry.
  • Constant/index in formulas.

PROBABILITY

  • Concentration parameter (e.g., von Mises).

STATISTICS

  • Cohen's Kappa (agreement measure).
  • Appears in directional statistics.

PRONUNCIATION

Ancient Greek
sound [k]
Modern Greek
κάππα [ˈkapa] · sound [k] (before e/i: [c])

IN FORMULAS

HOW TO WRITE IT — click to copy

lowercase
variant
uppercasesame as the Latin letter: LaTeX has no command for it

DON'T CONFUSE IT

  • κ k χ x κ fits in the height of lowercase letters; the Latin k has a tall ascender.

Note: notations vary between books/fields; these are the most common usages.