DataDistribution[ddist, ...] represents a probability distribution of type ddist, estimated from a set of data.
GaussianIntegers is an option for FactorInteger, PrimeQ, Factor, and related functions that specifies whether factorization should be done over Gaussian integers.
Paneled
(Built-in Mathematica Symbol) Paneled is an option for Manipulate and related functions that specifies whether to give the output inside a panel.
UnsavedVariables is an option for Manipulate, DynamicModule, and related functions that specifies local symbols that should not be saved when the notebook containing them is ...
$PathnameSeparator is a string used as a separator when full file and directory names are constructed.
Functions for manipulating files. Different operating systems have different commands for manipulating files. Mathematica provides a simple set of file manipulation ...
Invariants is an option to the functions Isomorphism and IsomorphicQ that informs these functions about which vertex invariants to use in computing equivalences between ...
One
(Combinatorica Package Symbol) One is a tag used in several functions to inform the functions that only one object need be considered or only one solution be produced, as opposed to all objects or all ...
WeightingFunction is an option to the functions SetEdgeWeights and SetVertexWeights that tells the functions how to compute edge weights and vertex weights, respectively.
All the functionality in Algebra`Quaternions` is available in the newly created Quaternions Package.