AutoSpacing is an option for Style and Cell that specifies whether spaces between successive characters should be adjusted automatically.
BabyMonsterGroupB[] represents the sporadic simple baby monster group B.
Backward is a symbol that represents the backward direction for purposes of motion and animation.
Baseline is a symbol that represents the baseline for purposes of alignment and positioning.
Beep
(Built-in Mathematica Symbol) Beep[] generates an audible beep when evaluated.
BeginDialogPacket[integer] is a MathLink packet that indicates the start of the Dialog subsession referenced by integer.
BinaryFormat is an option for OpenRead and related functions that specifies that a stream should be opened in binary format, so that no textual interpretation of newlines or ...
BinaryImageQ[image] yields True if image has the form of a binary image, and False otherwise.
Blue
(Built-in Mathematica Symbol) Blue represents the color blue in graphics or style specifications.
Bottom
(Built-in Mathematica Symbol) Bottom is a symbol that represents the bottom for purposes of alignment and positioning.