Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)

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Par Impar Ludĕre

（ἀρτιασμός, ἄρτια ἢ περιττὰ παίζειν, ζυγὰ ἢ ἀζυγὰ παίζειν, ζυγὰ μόνα παίζειν, or ποσίνδα). The game of “odd or even,” much played by both Greeks and Romans. A person held in his hand a number of dice, nuts, coins, or other objects, and his opponent guessed whether the number of them was odd or even. The amount won or lost was either the objects themselves or a sum of money staked upon the guess (Pollux, ix. 101; Apollon.iii. 115; Plut. 816; Becker-Göll, Gallus, iii. 477).