URI
Notation
::
Caption
Order-fixing (double colon sign). Table 1b
Scope Note
The double colon :: indicates a relationship and fixes the order of the UDC numbers. The symbol is used when there is a need to stress that the number following the double colon is a specification (part of the definition) of the subject by adding attribute(s) to the preceding number and that the reverse order does not represent the same meaning
Examples
061.2(100)::[54+66]IUPAC International Union of Pure and Applied Chemistry
575::576.3 Cytogenetics
77.04::355.4 War photography
Broader class
--  COMMON AUXILIARY SIGNS