International Standard Serial Number, a unique eight-digit number used to identify a print or electronic periodical publication
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International Standard Audiovisual Number, a unique identifier for audiovisual works and related versions
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ISWN, the abbreviation of International Standard Wine Number, a coding scheme intended to give a unique identifier for each wine worldwide
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International Standard Book Number, a unique numeric commercial book identifier based upon the 9-digit Standard Book Numbering code
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International Standard Music Number, a thirteen-character alphanumeric identifier for printed music
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