CopyToClipboard[expr] replaces the contents of the clipboard with expr.
Underlined represents an underlined font.
$PerformanceGoal gives the default setting for the option PerformanceGoal for graphics and other algorithmic functions.
SinIntegral[z] gives the sine integral function Si(z).
BitXor
(Built-in Mathematica Symbol) BitXor[n_1, n_2, ...] gives the bitwise XOR of the integers n_i.
GoldenRatio is the golden ratio \[Phi] = 1/2 (Sqrt[5] + 1), with numerical value \[TildeEqual] 1.61803.
ItemSize is an option for Grid, Column, and related constructs that specifies the sizes to allow for items.
GridCreationSettings -> {opt_1 -> val_1, opt_2 -> val_2, ...} is a global option that specifies settings for the Create Table/Matrix dialog.
MaxwellDistribution[\[Sigma]] represents a Maxwell distribution with scale parameter \[Sigma].
ColumnLabels is an option for StemLeafPlot which specifies the labels for columns.