(Internet) Used to indicate sarcasm in imitation of Kappa as used on Twitch.tv

(Twitch-speak) An emote, often used as a postscript, to indicate that the preceding statement is sarcastic or false.

plural of kappa

The tenth letter of the Greek alphabet. / (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.

(Japanese mythology) A tortoise-like demon or imp.

(statistics) A statistical measure for assessing the reliability of agreement between a fixed number of raters.

plural of Fleiss' kappa

(UK, slang, derogatory) A female chav or townie.

plural of Kappa slapper

A temporal perceptual illusion that can arise when observers judge the elapsed time between sensory stimuli applied sequentially at different locations. Subjects tend to overestimate the time between stimuli when the distance between the stimuli is large, and to underestimate the time when the distance is small.