a two sided die is called a coin
this post was submitted on 22 Sep 2025
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Or you know, a coin.
Coins are just really unbalanced three-sided dice.
The odds of a US nickel landing on its edge is about 1 in 6000. If there are any other country's coins thicker the odds would probably get better.
The old UK £1 was similar in size but twice as thick. It's now 12-sided but not sure how that impacts the odds.
I know there's a way to figure that out, but I have no idea where to start. So I'm going with 1 in 3000, plus or minus 42.
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That extremely rare, almost-never chance of landing on the edge is exactly what I would program into a game if I made one, instead of exactly 50% odds.
I brought this up in maths class once. The teacher agreed that the edge was a possibility and since he was involved in football, they used to flip the coin and let it land on the ground. More than once it stuck in the mud in the edge.
Then told us to ignore that possibility.
It should come with some bizarre consequence, too. If it were the Oregon Trail game, there should be a tiny chance that the player finds an ancient artifact that glows and hums when touched. An alien ship swoops in and abducts the party, forcing them to join the crew. From there on, it's a space pirate game with zero explanation why and no references in the product literature. Also, customer service pretends not to know about it, if contacted.
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Don't be ridiculous, obviously you roll a d20, subtract one, and then count how many digits the result has
Roll a d100, if it is odd 1, 2 if even
I like how you'd be rolling two d10's, and then completely ignoring one of them.
It keeps the statisticians happy
Too expensive.
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This gave me an idea for a gimmick die. Transparent die filled with dark liquid. The exterior of the die has the usual numbers in white lettering. Inside the die, there is a smaller cork die that rises like a magic 8ball. It’s 2d(x) in 1. Interesting for tension building, if nothing else.
Edit: looked it up and I’m not original, and they’re largely as bad as I thought they’d be
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I'm a bit disappointed that many of these n-sided dice are not isohedral, despite isohedral polyhedra existing for many of these values of n.
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The picture is of a d4. Dice are measured counting the flats (and therefore possible number of different results) not mathematically defined "sides".
No, dN means there are N different outcomes. Does not matter if they are flat or anything. Cube with two of each number from 1 to 3 is a d3.
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At first glance I thought this was an AI generated picture of a roll of toilet paper..
That's a weird looking coin
I've seen this shape uses as a D4. Nothing cursed about it. About as threatening to me as a Labrador puppy.
this is four sides??
It's four-sided, not two-sided. If that one counts, you can also just use a regular six-sided one and just put three 'ones' and three 'twos' on it.
This die can only ever land on two distinct sides so it has two sides.
Incorrect. It can land on two different sides. Or it can roll off the table and under something, leaving you in a state of limbo.
It has only 1 corner, and 2 surfaces, making it 2 sided. The 2 sides just happen to be curved
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It has two sides. They're curved, and it doesn't stay on the curve part, so you can effectively use it as a d4, but it's still only two-sided.
Sort of like how you can flip a Mobius strip like a coin and it will land one of two ways, but it still only has one side.
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define 'side'.
How many sides on a ball?
Inside, outside, and, depending on the ball, offsides.
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