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 ...
Blue
(Built-in Mathematica Symbol) Blue represents the color blue in graphics or style specifications.
BoxMargins is an option for AdjustmentBox objects that specifies the margins to leave around the contents of the box.
BracketingBar[x, y, ...] displays as |x, y, ...|.
ButtonData is an option for the low-level function ButtonBox that specifies the second argument to give to the ButtonFunction for the button when the button is active and is ...
ButtonMinHeight is an option for the low-level function ButtonBox that specifies the minimum total height in units of font size that should be allowed for the button.
Byte
(Built-in Mathematica Symbol) Byte represents a single byte of data in Read.
CallPacket[integer, list] is a MathLink packet encapsulating a request to invoke the external function numbered integer with the arguments contained in list.
CatalanNumber[n] gives the n\[Null]^th Catalan number C_n.