SPIN (Searchable Physics Information Notices) bibliographic database is an indexing and abstracting service produced by the American Institute of Physics (AIP). The content focus of SPIN is described as the most significant areas of physics research. This type of literature coverage spans the major physical science journals and magazines. Major conference proceedings that are reported by the American Institute of Physics, member societies, as well as affiliated organizations are also included as part of this database. References, or citations, provide access to more than 1.5 million articles as of 2010. SPIN has no print counterpart.