Hyperlink[uri] represents a hyperlink that jumps to the specified URI when clicked. Hyperlink[label, uri] represents a hyperlink to be displayed as label.
ModularLambda[\[Tau]] gives the modular lambda elliptic function \[Lambda](\[Tau]).
NominalVariables is an option for fitting functions such as LinearModelFit that specifies which variables should be treated as having discrete values specified by names.
PadRight[list, n] makes a list of length n by padding list with zeros on the right. PadRight[list, n, x] pads by repeating the element x. PadRight[list, n, {x_1, x_2, ...}] ...
Play
(Built-in Mathematica Symbol) Play[f, {t, t_min, t_max}] creates an object that plays as a sound whose amplitude is given by f as a function of time t in seconds between t_min and t_max.
PrivateNotebookOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for notebooks that specifies various low-level notebook settings.
RiemannSiegelZ[t] gives the Riemann\[Dash]Siegel function Z(t).
Scan
(Built-in Mathematica Symbol) Scan[f, expr] evaluates f applied to each element of expr in turn. Scan[f, expr, levelspec] applies f to parts of expr specified by levelspec.
SetSharedVariable[s_1, s_2, ...] declares the symbols s_i as shared variables whose values are synchronized among all parallel kernels.
StirlingS2[n, m] gives the Stirling number of the second kind \[ScriptCapitalS]_n^(m).