What is the class number 000 all about in Dewey Decimal Classification system?

The Dewey Decimal Classification (DDC) system does not have a class number "000." The DDC starts with "000" as the main class for Computer science, information & general works, but there is no specific class numbered "000" within that main class.

Here's a breakdown:

* 000: This is the main class for Computer science, information, and general works. It encompasses topics like:

* Computer science

* Information science

* General reference works

* Bibliography

* Library science

* Publishing

* Encyclopedias

* Yearbooks

* General works on specific subjects

* Specific classes within 000: Within the 000 class, there are further classifications, each with its own number, such as:

* 001: Knowledge and theory of knowledge

* 002: The book and the book trade

* 003: Systems of information

* 004: Data processing (including computers)

* 005: Computer programming

* 006: Computer applications

* 007: Computer hardware

* 008: General works on specific languages

Therefore, "000" itself isn't a specific classification, but rather a broad category that encompasses various subjects related to information and computing.