Commonest[list] gives a list of the elements that are the most common in list.Commonest[list, n] gives a list of the n most common elements in list.
Composition[f_1, f_2, f_3, ...] represents a composition of the functions f_1, f_2, f_3, ....
Conjunction[expr, {a_1, a_2, ...}] gives the conjunction of expr over all choices of the Boolean variables a_i.
ConoverTest[{data_1, data_2}] tests whether the variances of data_1 and data_2 are equal.ConoverTest[dspec, \[Sigma]_0^2] tests a dispersion measure against ...
ControlActive[act, norm] evaluates to act if a control that affects act is actively being used, and to norm otherwise.
CovarianceEstimatorFunction is an option for generalized linear model fitting functions that specifies the estimator for the parameter covariance matrix.
DamerauLevenshteinDistance[u, v] gives the Damerau\[Dash]Levenshtein distance between strings or vectors u and v.
DiscreteDelta[n_1, n_2, ...] gives the discrete delta function \[Delta] (n_1, n_2, ...), equal to 1 if all the n_i are zero, and 0 otherwise.
DispersionEstimatorFunction is an option for generalized linear model fitting functions that specifies the estimator for the dispersion parameter.
Divisible[n, m] yields True if n is divisible by m, and yields False if it is not.