GraphDisjointUnion[g_1, g_2] gives the graph disjoint union of the graphs g_1 and g_2.GraphDisjointUnion[g_1, g_2, ...] gives the disjoint union of g_1, g_2, ....
ImageConvolve[image, ker] gives the convolution of image with kernel ker.
Intersection[list_1, list_2, ...] gives a sorted list of the elements common to all the list_i.
Missing
(Built-in Mathematica Symbol) Missing[] represents data that is missing.Missing["reason"] specifies a reason for the data being missing.Missing["reason", expr] associates the expression expr with the ...
PermutationLength[perm] returns the number of integers moved by the permutation perm.
PolarTicks is an option for sector charts and polar plots that specifies tick marks for polar axes.
PrimeNu
(Built-in Mathematica Symbol) PrimeNu[n] gives the number of distinct primes \[Nu](n) in n.
PrimeOmega[n] gives the number of prime factors counting multiplicities \[CapitalOmega](n) in n.
SkeletonTransform[image] gives the skeleton transform of image, in which the value of each skeleton pixel is its distance to the nearest background ...
Through
(Built-in Mathematica Symbol) Through[p[f_1, f_2][x]] gives p[f_1[x], f_2[x]]. Through[expr, h] performs the transformation wherever h occurs in the head of expr.