This is documentation for Mathematica 4, which was
based on an earlier version of the Wolfram Language.
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FilledSmallSquare$VersionNumber is a real number which gives the current Mathematica kernel version number, and increases in successive versions.

FilledSmallSquare To find out if you are running under Version 4 or above, you can use the test TrueQ[$VersionNumber >= 4.0].

FilledSmallSquare A version with a particular number is typically derived from the same source code on all computer systems.

FilledSmallSquare See The Mathematica Book: Section 2.13.5.

FilledSmallSquare See also: $ReleaseNumber.