VectorAngle (Built-in Mathematica Symbol)

VectorAngle[u, v] gives the angle between the vectors u and v.

LengthWhile (Built-in Mathematica Symbol)

LengthWhile[list, crit] gives the number of continuous elements e_i starting at the beginning of list for which crit[e_i] is True.

PowersRepresentations (Built-in Mathematica Symbol)

PowersRepresentations[n, k, p] gives the distinct representations of the integer n as a sum of k non-negative p\[Null]^th integer powers.

LabelPoints (Computational Geometry Package Symbol)

LabelPoints is an option to DiagramPlot and PlanarGraphPlot that specifies whether to label points according to their position in the input list.

CommunityStructureAssignment (Graph Utilities Package Symbol)

CommunityStructureAssignment[g] gives the assignment of vertices of a graph g into communities.

WavelengthAbsorptionMap (Resonance Absorption Lines Package Symbol)

WavelengthAbsorptionMap[wavelength_1, wavelength_2] generates a plot of the absorption map in the wavelength range between wavelength_1 and wavelength_2.

FindCurvePath (Built-in Mathematica Symbol)

FindCurvePath[{{x_1, y_1}, {x_2, y_2}, ...}] gives an ordering of the {x_i, y_i} that corresponds to one or more smooth curves.

FontSlant (Built-in Mathematica Symbol)

FontSlant is an option for Style, Cell, and related constructs that specifies how slanted characters in text should be.

FontWeight (Built-in Mathematica Symbol)

FontWeight is an option for Style, Cell, and related constructs that specifies how heavy the characters in a font should be.

InterpolationPoints (Built-in Mathematica Symbol)

InterpolationPoints is an option to SmoothKernelDistribution and FunctionInterpolation that specifies the initial number of interpolation points to use.