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FilledSmallSquare$System is a string describing the type of computer system on which Mathematica is being run.

FilledSmallSquare$System typically consists of words separated by spaces.

FilledSmallSquare Typical values are "Microsoft Windows", "Power Macintosh", "Linux" and "Solaris".

FilledSmallSquare$SystemID provides a more succinct version of the same information.

FilledSmallSquare See The Mathematica Book: Section 2.13.5.

FilledSmallSquare See also: $SystemID, $Version, $MachineType, $ProcessorType, $OperatingSystem.