MatrixQ
(Built-in Mathematica Symbol) MatrixQ[expr] gives True if expr is a list of lists or a two-dimensional SparseArray object that can represent a matrix, and gives False otherwise. MatrixQ[expr, test] gives ...
MaxSteps is an option to functions like NDSolve that specifies the maximum number of steps to take in generating a result.
PaneSelector[{v_1 -> expr_1, v_2 -> expr_2, ...}, v] represents an object that displays as a pane containing the expr_i for which v_i is equal to v.
ParagraphSpacing is an option for Cell, StyleBox, and Style that specifies how much extra space to leave between successive paragraphs of text.
PlotLabel is an option for graphics functions that specifies an overall label for a plot.
PopupWindow[expr, contents] displays as expr, but pops up a window containing contents when clicked.
Rescale
(Built-in Mathematica Symbol) Rescale[x, {min, max}] gives x rescaled to run from 0 to 1 over the range min to max. Rescale[x, {min, max}, {x_min, x_max}] gives x rescaled to run from x_min to x_max over ...
ScalingMatrix[{s_x, s_y, ...}] gives the matrix corresponding to scaling by a factor s_i along each coordinate axis.ScalingMatrix[s, v] gives the matrix corresponding to ...
Slot
(Built-in Mathematica Symbol) # represents the first argument supplied to a pure function. # n represents the n\[Null]\[Null]^th argument.
## represents the sequence of arguments supplied to a pure function. ## n represents the sequence of arguments supplied to a pure function, starting with the ...