AutoSpacing is an option for Style and Cell that specifies whether spaces between successive characters should be adjusted automatically.
Axes
(Built-in Mathematica Symbol) Axes is an option for graphics functions that specifies whether axes should be drawn.
Beep
(Built-in Mathematica Symbol) Beep[] generates an audible beep when evaluated.
BinaryImageQ[image] yields True if image has the form of a binary image, and False otherwise.
BinomialDistribution[n, p] represents a binomial distribution with n trials and success probability p.
CircleMinus[x, y] displays as x\[CircleMinus]y.
ClearSystemCache[] clears internal system caches of stored results.
ColumnsEqual is an option for the low-level function GridBox which specifies whether all columns in the grid should be assigned equal width.
ComplexExpand[expr] expands expr assuming that all variables are real. ComplexExpand[expr, {x_1, x_2, ...}] expands expr assuming that variables matching any of the x_i are ...
ConfidenceLevel is an option for LinearModelFit and other fitting functions that specifies the confidence level to use in generating parameter and prediction intervals.