Coins vs. d2[edit source]

Regarding the attempt to say a d2 is a coin: by definition, a die is a polyhedron. If you think of a coin as just its two faces, then it has no volume, so is not a polyhedron. If you you include the edge as a third side, then you have volume, but that third side is curved, so again not a polyhedron. A coin is a legitimate way to simulate a d2, but it is not itself a d2. --The Krit (talk) 02:09, December 15, 2014 (UTC)

Half of the problem is the definition of what a die is. Some sources (e.g. Mirriam Webster online, Oxford dictionaries online, etc.) will only use the old definition of a marked cube, other newer definitions include the possibility of curved surfaces, allowing for 2 sided and 3 sided- these products are sold under the name dice. While wiktionary does take an intermediary ground, I have seen very few sources for this stance compared to the others. Even using a polyhedron one can certainly fashion one such that three sides will each have a 1/3 chances with the other sides being unstable and thus having a 0 chance (for instance a long triangular prism with triangular pyramids replacing the end faces). WhiZard (talk) 02:44, December 15, 2014 (UTC)
  • Hmm... Since games did kind of co-opt the name "die" to cover things with other than 6 sides, I guess the definition is kind of malleable. I could accept dropping the polyhedron bit to include that d3, but the d2 example doesn't strike me as right for the term -- a flat cylinder (coin) does not really roll the way other dice roll. You can make it work, but it feels wrong. Have you seen "two-sided dice" (not just coins used for that purpose) outside joke dice? --The Krit (talk) 04:53, December 15, 2014 (UTC)
  • The most convincing one I have seen is this one which has two sides but four landing surfaces (allowing it to be either d2 or d4). But the coin, I do not see much justification for, as it does not have a defined enough 3rd dimension so that it can be "rolled." WhiZard (talk) 05:13, December 15, 2014 (UTC)
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