Definition of "kappa"

kappa¹

/ˈkæpə/

noun
countable and uncountable, plural kappas
1. The tenth letter of the Greek alphabet.
2. (finance) A measurement of the sensitivity of the value of an option to changes in the implied volatility of the price of the underlying asset.

kappa²

/ˈkæpə/

noun
plural kappas
1. (Japanese mythology) A tortoise-like demon or imp.
  Quotations
  It was not quite possible for a kappa to go pale, but this one managed, shrinking partly into its shell.
  2013, Laura VanArendonk Baugh, Kitsune-Mochi: Kitsune Tales #2‎, page 94