International Standard Serial Number International Standard Serial Number An International Standard Serial Number (ISSN) is an eight-digit serial number used to uniquely identify a serial publication. The ISSN is especially helpful in distinguishing between serials with the same title. ISSN are used in ordering, cataloging, interlibrary loans, and other practices in connection with serial literature. The ISSN system was first drafted as an International Organization for Standardization (ISO) international standard in 1971 and published as ISO 3297 in 1975. ISO subcommittee TC 46/SC 9 is responsible for maintaining the standard. When a serial with the same content is published in more than one media
Opposite (semantics) the pattern of "non-person" could conceivably be extended to "non-platypus". Conversely, some words appear to be a prefixed form of an opposite, but the opposite term does not exist, such as "inept," which appears to be "in-" + *"ept;" such a word is known as an unpaired word￼￼. Opposites may be viewed as a special type of incompatibility. Words that are incompatible create the following type of entailment (where "X" is a given word and "Y" is a different word incompatible with word X): An example of an incompatible pair of words is "cat : dog": This incompatibility is also