ListContourPlot3D[array] generates a contour plot from a three-dimensional array of values. ListContourPlot3D[{{x_1, y_1, z_1, f_1}, {x_2, y_2, z_2, f_2}, ...}] generates a ...
MonomialList[poly] gives the list of all monomials in the polynomial poly.MonomialList[poly, {x_1, x_2, ...}] gives the list of monomials with respect to the variables x_i in ...
MousePosition[] gives the current mouse position in the notebook front end. MousePosition["coords"] gives the mouse position with respect to the specified coordinate ...
NameQ
(Built-in Mathematica Symbol) NameQ["string"] yields True if there are any symbols whose names match the string pattern given, and yields False otherwise.
NotebookAutoSave is a notebook option which specifies whether the notebook should automatically be saved after each piece of output generated by evaluation in it.
NullRecords is an option for Read and related functions which specifies whether null records should be taken to exist between repeated record separators.
NullWords is an option for Read and related functions which specifies whether null words should be taken to exist between repeated word separators.
NumberMultiplier is an option for NumberForm and related functions which gives the string to use as a multiplication sign in scientific notation.
NumberPoint is an option for NumberForm and related functions which gives the string to use as a decimal point.
NumberQ
(Built-in Mathematica Symbol) NumberQ[expr] gives True if expr is a number, and False otherwise.