DefaultFontProperties (Built-in Mathematica Symbol)

DefaultFontProperties is a global option that specifies various properties of a font family, such as its character encoding and whether it is monospaced.

DefaultFormatType (Built-in Mathematica Symbol)

DefaultFormatType is an option for cells that specifies the format used for displaying expressions in a newly created cell.

$ConfiguredKernels (Built-in Mathematica Symbol)

$ConfiguredKernels is the default list of kernels that are configured to be launched for parallel computing.

DefaultInlineFormatType (Built-in Mathematica Symbol)

DefaultInlineFormatType is an option for cells that specifies the format used for displaying expressions in a newly created inline cell.

Standard Namespaces (Mathematica Guide)

Mathematica allows arbitrary hierachical namespaces. However, several standard "contexts" are conventionally used for predefined purposes.

BaseStyle (Built-in Mathematica Symbol)

BaseStyle is an option for formatting and related constructs that specifies the base style to use for them.

$Assumptions (Built-in Mathematica Symbol)

$Assumptions is the default setting for the Assumptions option used in such functions as Simplify, Refine, and Integrate.

Inherited (Built-in Mathematica Symbol)

Inherited represents an option value to be inherited from an enclosing style, cell, or notebook.

SetOptions (Built-in Mathematica Symbol)

SetOptions[s, name_1 -> value_1, name_2 -> value_2, ...] sets the specified default options for a symbol s. SetOptions[stream, ...] or SetOptions["name", ...] sets options ...

Pattern (Built-in Mathematica Symbol)

s : obj represents the pattern object obj, assigned the name s.