In libraries, notation is often used as a standardized way of organizing and retrieving information. Notation systems can be used to classify books, articles, and other resources based on the subject matter, author, format, and other criteria.

One of the most commonly used notation systems in libraries is the Dewey Decimal Classification (DDC), which assigns a unique number to each subject area. For example, books on mathematics are assigned a number in the 500s, while books on literature are assigned a number in the 800s. This allows library users to browse the shelves in a systematic way, finding books on a particular topic grouped together.

Another popular notation system used in libraries is the Library of Congress Classification (LCC), which is often used in academic libraries. The LCC uses a combination of letters and numbers to organize books by subject, author, and other criteria.

Notation is also used in cataloging records to help identify specific resources. For example, a book’s ISBN (International Standard Book Number) is a unique identifier that is used to help libraries keep track of their holdings and to help patrons locate specific books.

Overall, notation plays an important role in libraries by helping to organize and retrieve information in a consistent and standardized way.

### Definition of Notation

Harrods Librarian Glossary (Tenth ed.) “The symbols which stand for the divisions in a scheme of classification.”

Harrods Librarian Glossary “A Notation is the ordered, series or symbol that stand for the ordered, series or terms in the classification schedule.”

W. Howard Phileps “A book notation is a series of symbols in which stand for the name of a class or any division or subdivision of a class and forms of a convenient means of reference to the arrangement of a classification.”

H.E Bliss “Notation as a system of marks and symbols in some order, denoting terms or member of a series or system of things.”

A book notation is a series of symbols that stands for the name of a class or any division or subdivision of a class and forms a convenient means of reference to the arrangement of a classification.

The notation is an essential addition to a classification schedule; it has in no way determined its logic, its scope, or its sequence of development. It furnishes a convenient reference to the arrangement of classification; the symbol is not assigned until after the schedule has been worked out. It has no more bearing on the preparation of the logic of a classification outline than the chapter numbers of a book have in fixing the t5hemes of those chapters.

In most book classifications, the notation is a symbol that stands for either the subject of the book or the style of writing. Since the notation is a sign translation of the classification, it usually ensures when it is added to the backs of books. This book arrangement represents the order of the schedules.

A notation is essential for the practical application of book classification; without notation, it would be impossible to apply classification to books. As classification is the “foundation of librarianship,”‘ it can be said that”notation is the basis of practical book classification.”

**Types of Notation****:**

**Pure Notation****Mixed Notation**

**1. Pure Notation:**Pure Notation consists of only one type of symbol. i.e. Arabic numeral (0,1,2…..9) and Roman letter (A-Z). It is found in DDC (Dewey Decimal Classification)e and the Enumerative Classification scheme.

**For example**:

- 020 stands for Library & Information Science,
- 210 Philosophy & theory of religion
- 370 Education
- 420 English & Old English languages
- 510 stands for Mathematics, etc.
- 800 Literature, rhetoric & criticism
- 920 Biography & genealogy

**2. Mixed Notation:**Mixed notation consists of two or more types of notation. It is a mixture of letters and numbers, i.e., Arabic numeral and Roman letter (0-9) + (A-Z). It is found in UDC, LC, CC, BC & SC schemes.

**For example:**

- LCq- Science
- QC- Physic
- QC1- Periodicals.
- JC47 – Oriental state
- JF20-2112 – Political institutions and public administration

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I mean the types of notation