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When writing software, there are often situations where I need a parameter to be a floating point number $x \in [0,1]$. I don't know of a name for that category, but I think there must be one because it's such a useful categories. Perhaps there's a name in probability theory?

(If they don't have a name, I hereby declare them to be "wombat numbers".)

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    I'm running into the same question wrt probability numbers. Since all of the "official" answers seem to be multiword ("property fraction", "unit interval"), I'm going to go ahead and accept your declaration of "wombat" numbers, with my code reading getFloat(), getInt(), getWombat().2013-09-22

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Sometimes I've heard it called the "unit interval" as it "probability measures are functions from a boolean algebra to the unit interval"

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    @Seamus To the contrary, naming things is [one of the hard problems](http://martinfowler.com/bliki/TwoHardThings.html). Only wimps give up on meaningful names. ;)2014-02-14
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I guess you could call them fractional numbers. But that might be a bit confusing :)

Another option would be "fuzzy truthvalue" or "fuzzy boolean".