Snake eyes

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Two dice with single pip on top

In gambling, snake eyes is the outcome of rolling the dice in a game of craps and getting only one pip on each die. The pair of pips resembles a pair of eyes, which is appended to the term 'snake' because of the long-standing association of this word with treachery and betrayal. The dictionary of etymology traces that use of the term back to 1929,^[1] although it may be traced all the way back to the ancient Roman dice games, where 'Dogs' represented two ones. They referred to this as "the dog throw". In modern parlance, it refers to such a roll in any game involving dice.

Games

Because this is the lowest possible roll, and will often be a loser in many dice games, such as Craps, the term has been employed in a more general usage as a reference to bad luck. In many board games such as Monopoly, house rules may decide that rolling Snake Eyes (or any Doubles) leads to a bonus since they are rarely rolled.^[2][specify]

Probability

Rolling two 6-sided dice 25 times gives a probability of .505532 that at least once, Snake eyes will appear.^[3]

Notes

1. ^ Online Etymology Dictionary
2. ^ "How to Play Monopoly On a Roll™". rgsgames.com. https://platform.rgsgames.com/Common/HTML/gameshelp/game_help_0044_0.html. Retrieved 2009-10-15. 
3. ^ Weisstein, Eric (2003). CRC Concise Encyclopedia of Mathematics. CRC Press. pp. 276. ISBN 9781584883470. http://books.google.ca/books?id=_8TyhSqHUiEC&pg=PA276&dq=Boxcars+dice#PPA369,M1.