13S

13S is an alphanumeric designation used in multiple, unrelated systems to label a specific item, region, or category within a sequence. The meaning of 13S varies by domain and is not a universal identifier. In geospatial contexts, 13S appears as a UTM (Universal Transverse Mercator) zone designation, where the number indicates the zone and the letter (S) indicates the latitude band. Such codes are used in coordinate references and GIS datasets to specify a location frame of reference.

In meteorology, 13S is often used in tropical cyclone tracking to label the thirteenth cyclone of a season within the Southern Hemisphere. The format mirrors other regional cyclone numbering conventions that append a region letter to a sequential number.

In manufacturing and product catalogs, 13S commonly serves as a model number, part code, or lot identifier for a specific item or variant within a series; the exact specifications—dimensions, features, or compatibility—depend on the producer.

In archival, library, or inventory systems, 13S may appear as a collection code, shelfmark, or catalog identifier used to organize items.

Overall, 13S demonstrates how letters appended to numbers function as regional, categorical, or sequential markers across disciplines. When encountering 13S, consulting the relevant domain’s catalog, dataset, or metadata is necessary to determine its precise meaning in that context.