FileExtension (Built-in Mathematica Symbol)

FileExtension["file"] gives the file extension for a file name.

FileNameSplit (Built-in Mathematica Symbol)

FileNameSplit["filename"] splits a file name into a list of parts.

MemoryInUse (Built-in Mathematica Symbol)

MemoryInUse[] gives the number of bytes currently being used to store all data in the current Mathematica kernel session. MemoryInUse[$FrontEnd] gives the number of bytes ...

SystemOptions (Built-in Mathematica Symbol)

SystemOptions["name"] gives the current setting for the internal system option with the specified name.SystemOptions[] gives the current settings for all settable internal ...

$CharacterEncodings (Built-in Mathematica Symbol)

$CharacterEncodings gives the list of character encodings that can be used.

$KernelCount (Built-in Mathematica Symbol)

$KernelCount gives the number of subkernels available for parallel computations.

[Right-click] > Get Coordinates (Mathematica Menu Item)

Get Coordinates displays the approximate coordinate values of the mouse position.

[Right-click] > Save Image As... (Mathematica Menu Item)

Save Image As saves the selected (or clicked upon) graphic in a file with the specified format.

AxesStyle (Built-in Mathematica Symbol)

AxesStyle is an option for graphics functions that specifies how axes should be rendered.

Full (Built-in Mathematica Symbol)

Full is a setting used for certain options, typically indicating that a full range of values should be included.