Catalog number (commercial products)

When companies make things, like toys or books, they give each of those things a special number called a catalog number. This number helps the company keep track of all the things they make and helps people find and buy the things they want. Think of it like a big library. Each book has a number on its spine that tells the librarian where the book goes on the shelf. The catalog number works the same way for things that a company makes. It helps everyone keep organized and makes it easier to find what they need.