# ISN

CEFR C2 · Noun

Source: https://englishreference.com/word/isn
Updated: 2026-05-09

## Definition

Stands for International Standard Number. A unique set of numbers used to identify specific items like books, magazines, or music recordings in a global system.

For teachers: Abbreviation for International Standard Number. A generic term for various globally recognized identification codes, such as ISBN for books or ISSN for serial publications, used to facilitate cataloguing and trade.

## Examples

- Every published book needs a unique ISN to be tracked.
- The library database uses the ISN to ensure that the correct edition of the journal is retrieved for the researcher.
- While individual sectors have specific codes like the ISBN, the broader concept of an ISN allows for a standardized approach to metadata across diverse media formats and international borders.

## Usage notes

- Often used as a collective term in library science and publishing contexts.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.