DDC number
Find the DDC number types WebDewey provides records for, including examples and descriptions.
WebDewey provides records for the following types of DDC numbers.
| Number type | Example | Description |
|---|---|---|
| Class number | 004.67 | Number or span of numbers provided in the DDC schedules to represent a subject. |
| Built class number | B 598.176 | A number constructed according to add instructions stated or implied in the schedules or tables to represent a specific subdivision of a DDC class. |
| Centered entry | C 930-990 | Represents a subject covered by a span of numbers. |
| Optional number | (921) | Number enclosed in parentheses; a class number that is an optional alternative to the number usually assigned to a concept. |
| Bracketed number | [104] Unassigned 511[.22] Intuitionistic mathematics [291] Comparative religion T5--[04] Persons of mixed ancestry with ethnic origins from more than one continent |
Number enclosed in square brackets; a number that has been discontinued or relocated, or an unassigned number. Record instructs you not to use this number and provides a cross-reference to the correct class number. |
| Table number | T1--071 | Number for an entry in one of the DDC tables. Provides notation that can be added to other numbers to make a class number appropriately specific to the work being classified. |
| Built table number | T4--092 | A number constructed according to add instructions stated or implied in the schedules or tables to represent a specific subdivision of a DDC table. ADD IMAGE |
| Table centered entry | T2--4- T2--9 |
Number used to indicate and relate structurally a span of table numbers that together form a single concept. |
| Manual number | M 361-365 | A number or range of numbers covered in an entry in the DDC Manual. The manual entry explains the proper use of the class number (or range). ADD IMAGE |