“We can regard the vector ci as representing certain physical, social, and psychological attributes of player i himself in that it summarizes some crucial parameters of player i's own payoff function Ui as well as the main parameters of his beliefs about his social and physical environment… the rules of the game as such allow any given player i to belong to any one of a number of possible types, corresponding to the alternative values of his attribute vector c i could take… Each player is assumed to know his own actual type but to be in general ignorant about the other players' actual types.”

—  John Harsanyi

Source: "Games with Incomplete Information Played by “Bayesian” Players," 1967, p. 171; As quoted in: Mertens, Jean-Francois, and Shmuel Zamir. " Formulation of Bayesian analysis for games with incomplete information http://jeremy-chen.org/sites/default/files/files/convexset/2013_01/formulation_of_bayesian_analysis_for_games_with_incomplete_information_mertens_and_zamir_1985.pdf." International Journal of Game Theory 14.1 (1985): p. 1-2

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John Harsanyi 12
hungarian economist 1920–2000

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