What does ISBN stand for?

• A. International Standard Book Number
• B. International System of Book Names
• C. Institutional Standard Book Number
• D. Integrated Serial Book Number

Answer: (A)

The main idea here is recognizing a standard global identifier used for books. ISBN stands for International Standard Book Number, a formal system that uniquely identifies a specific edition of a book. Each part of the name fits: “International” means it’s used worldwide, “Standard” signals a universally adopted method, “Book” points to the item being identified, and “Number” shows it’s a numeric code. This identifier helps publishers, booksellers, libraries, and readers know exactly which edition is being referenced, avoiding confusion between similar titles or different printings. Since 2007, ISBNs are 13 digits long and are tied to barcodes for easy scanning, though older books may show a 10-digit form. The other phrases don’t reflect the actual, widely used term, so they aren’t correct.