Mathematica provides users with access to their computer's file system (Files), interprocess communication (MathLink Mathematica Functions), evaluation of data as code ...
Interpretation[e, expr] represents an object that displays as e, but is interpreted as the unevaluated form of expr if supplied as input. Interpretation[{x = x_0, y = y_0, ...
SpheroidalJoiningFactor[n, m, \[Gamma]] gives the spheroidal joining factor with degree n and order m.
CellContext is an option for Cell which specifies the context to use for the evaluation of the contents of the cell.
RamanujanTauZ[t] gives the Ramanujan tau Z-function Z(t).
SpheroidalS1Prime[n, m, \[Gamma], z] gives the derivative with respect to z of the radial spheroidal function S_n^m, (1)(\[Gamma], z) of the first kind.
ButtonBar[{lbl_1 :> act_1, lbl_2 :> act_2, ...}] represents a bar of buttons with labels lbl_i that perform actions act_i when pressed.
BesselK
(Built-in Mathematica Symbol) BesselK[n, z] gives the modified Bessel function of the second kind K_n (z).
BesselY
(Built-in Mathematica Symbol) BesselY[n, z] gives the Bessel function of the second kind Y_n (z).
ReplaceAllUnheld[expr, rules] applies a rule or list of rules in an attempt to transform each subpart of expr that would be automatically evaluated.