Etruscan numerals whether the numbers on opposite faces of Etruscan dice add up to seven, like nowadays. Some dice found did not show this proposed pattern. An aspect of the Etruscan numeral system is that some numbers, as in the Roman system, are represented as partial subtractions. So "17" is not written *"semφ-śar" as users of the Arabic numerals might reason. One instead finds "ci-em zaθrum", literally "three from twenty". The numbers 17, 18 and 19 are all written in this way. The general agreement among Etruscologists nowadays is the following (except about which of huθ and śa were "four" or "six",
Dice notation the probability curve towards the higher numbers, as a result a roll of 3 can only occur when all four dice come up 1 (probability 1/1296), while a roll of 18 results if "any" three dice are 6 (probability 21/1296 = 7/432). Rolling three or more dice gives a probability distribution that is approximately Gaussian, in accordance with the central limit theorem. In some games, the above notation is expanded to allow for a multiplier, as in A"d"X"×"C or C"×d"X, where: For example, Multiplication can also mean repeating throws of similar setup (usually represented by the letter, x, rather than