Coins are just really unbalanced three-sided dice.

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.


define 'side'. How many sides does a square coin have?

This die can only ever land on two distinct sides so it has two sides.

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.

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.

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.

I'm a bit disappointed that many of these n-sided dice are not [isohedral](https://en.wikipedia.org/wiki/Isohedral_figure), despite isohedral polyhedra existing for many of these values of n.

The weirdly shaped ones probably sell better. Which would you pick up in a store?

I'm really surprised that this does not seem to he an existing thing for d10s specifically. I can find nested d10s and there are heaps of liquid core dice, but apparently none that combine those two ideas

Don't be ridiculous, _obviously_ you roll a d20, subtract one, and the count how many digits the result has

It's called a chance cube and it's essential on tatooine

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.

Oh, I still bought the full set, but I tried to get isohedral dice whenever possible.

It has only 1 corner, and 2 surfaces, making it 2 sided. The 2 sides just happen to be curved

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.

4 sided.

Roll a d100, if it is odd 1, 2 if even

Fair point. A ball has either one or infinite sides from my perspective.