DefaultDuration is an option to Animate and related functions that specifies the default total duration of the animation in seconds.

RefreshRate is an option to Animate and related functions which specifies the refresh rate for frames in animations.

SpellingCorrection is an option for StringMatchQ, Names, and related functions that specifies whether strings should be considered to match even when a small fraction of the ...

TextPacket[string] is a MathLink packet containing string, the text output from Mathematica as produced by functions such as Print.

$Failed is a special symbol returned by certain functions when they cannot do what they were asked to do.

$PerformanceGoal gives the default setting for the option PerformanceGoal for graphics and other algorithmic functions.

Mathematica 8 adds major new areas, including probability and statistics, graphs and networks, computational finance, control systems, wavelet analysis, and group theory. ...

EventLabels is an option to CandlestickChart, KagiChart, and similar functions that specifies events to labels.

RoundingRadius is an option for Rectangle, Framed, and related functions that specifies the radius of the circle to use in rendering rounded corners.

LinearModelFit[{y_1, y_2, ...}, {f_1, f_2, ...}, x] constructs a linear model of the form \[Beta]_0 + \[Beta]_1 f_1 + \[Beta]_2 f_2 + ... that fits the y_i for successive x ...