GeoPositionENU[{east, north, up}, p] represents a point with local Cartesian coordinates {east, north, up} in a reference system specified by the position p.
Gradient is an option for FindMinimum and related functions that specifies the gradient vector to assume for the function being extremized.
GraphPower[g, n] gives the graph-n\[Null]^th power of the graph g.
GroupActionBase is an option to specify a base for a group.
GroupElementQ[group, g] returns True if the object g is an element of group and False otherwise.
GroupGenerators[group] returns a list of generators of group.
GroupOrder[group] returns the number of elements of group.
HarmonicMeanFilter[image, r] filters image by replacing every value by the harmonic mean of the values in its range r neighborhood. HarmonicMeanFilter[data, r] applies ...
Head
(Built-in Mathematica Symbol) Head[expr] gives the head of expr.
Heads
(Built-in Mathematica Symbol) Heads is an option for functions which use level specifications that specifies whether heads of expressions should be included.