ISO 4 (Information and documentation - Rules for the abbreviation of title words and titles of publications) is an international standard which defines a uniform system for the abbreviation of serial titles, i.e., titles of publications such as scientific journals that are published in regular installments. The ISSN International Centre, which the International Organization for Standardization (ISO) has appointed as the registration authority for ISO 4, maintains the "List of Title Word Abbreviations" (LTWA), which contains standard abbreviations for words commonly found in serial titles. As of August 2017, the standard's most recent update came in 1997, when its third edition was released.
One major use of ISO 4 is to abbreviate the names of scientific journals using the List of Title Word Abbreviations (LTWA). For instance, under ISO 4 standards, the Journal of Biological Chemistry is cited as J. Biol. Chem., and the Journal of Polymer Science Part A should be cited as J. Polym. Sci. A (note capitalization is not specified by the standard).
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