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The erf (error function) completes the set of useful mathematical functions that cannot be derived from other words. I like the idea to leave out all the functions that can be described in terms of the available words, but the erf is not one of these. The erf is an important function in statistics, where it is linearly related to the normal (i.e., Gaussian) cumulative distribution function. See also the "68–95–99.7 rule".
Sorry for the last minute addition. I hope you didn't build the release yet.