InterpretationBox[boxes, expr] is a low-level box construct that displays as boxes but is interpreted on input as expr.
InversePermutation[perm] returns the inverse of permutation perm.
KelvinKer[z] gives the Kelvin function ker(z).KelvinKer[n, z] gives the Kelvin function ker_n (z).
LengthWhile[list, crit] gives the number of continuous elements e_i starting at the beginning of list for which crit[e_i] is True.
NotebookApply[notebook, data] writes data into a notebook at the current selection, replacing the first selection placeholder in data by the current selection, and then ...
OverscriptBox[x, y] is the low-level box representation for OverscriptBox[x, y] in notebook expressions.
ParallelNeeds["context"] evaluates Needs["context"] on all available parallel kernels.
PeronaMalikFilter[image] applies a Perona\[Dash]Malik diffusion filter to image.PeronaMalikFilter[image, t] specifies the amount of diffusion t to be applied. ...
Pi
(Built-in Mathematica Symbol) Pi is \[Pi], with numerical value \[TildeEqual] 3.14159.
PrincipalComponents[matrix] transforms elements of matrix into unscaled principal components.