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FilledSmallSquareOutputStream["name", n] is an object that represents an output stream for functions such as Write.

FilledSmallSquareOpenWrite and OpenAppend return OutputStream objects.

FilledSmallSquare The serial number n is unique across all streams, regardless of their name.

FilledSmallSquare See The Mathematica Book: Section 2.11.3.

FilledSmallSquare See also: Streams, InputStream.