Kappa (Κ κ) is the 10th letter of the Greek alphabet and has a numeric value of 20.
In mathematics, the Kappa Curve is named after this letter; the tangents of this curve were first calculated by Barrow (17th Century).
The upper-case letter Κ is used as a symbol for:
- In textual criticism, the Byzantine text-type (from Κοινη, Koine, the common text).