I know that&#x27;s what it means. I don&#x27;t think they exist in the real world. See e.g. <a href="http:&#x2F;&#x2F;www.stat.columbia.edu&#x2F;~gelman&#x2F;research&#x2F;published&#x2F;diceRev2.pdf" rel="nofollow">http:&#x2F;&#x2F;www.stat.columbia.edu&#x2F;~gelman&#x2F;research&#x2F;published&#x2F;dice...</a> - I don&#x27;t remember if I&#x27;ve read that specific thing, but I&#x27;ve read things that said the same.<p>(With skill, it&#x27;s possible to bias a coin <i>toss</i>, but that&#x27;s different.)