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based on an earlier version of the Wolfram Language.
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FilledSmallSquareNull is a symbol used to indicate the absence of an expression or a result. When it appears as an output expression, no output is printed.

FilledSmallSquare; ; ... ; ; returns Null, and prints no output.

FilledSmallSquare Expressions like f[,,] are interpreted to have Null between each pair of adjacent commas.

Further Examples