Optics Classification and Indexing Scheme
Encyclopedia
Optics Classification and Indexing Scheme (OCIS) is a categorization
Categorization
Categorization is the process in which ideas and objects are recognized, differentiated and understood. Categorization implies that objects are grouped into categories, usually for some specific purpose. Ideally, a category illuminates a relationship between the subjects and objects of knowledge...

 scheme used to encode the topic of an article or presentation in a 7-digit code. The system is used by the Optical Society of America
Optical Society of America
The Optical Society is a scientific society dedicated to advancing the study of light—optics and photonics—in theory and application, by means of publishing, organizing conferences and exhibitions, partnership with industry, and education. The organization has members in more than 100 countries...

 in the organization of conferences and for journal
Academic journal
An academic journal is a peer-reviewed periodical in which scholarship relating to a particular academic discipline is published. Academic journals serve as forums for the introduction and presentation for scrutiny of new research, and the critique of existing research...

publications. Authors are required to choose one or several OCIS numbers at submission.
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