D13

D13 is an alphanumeric designation used in multiple fields to label different objects, codes, or design variants. It does not refer to a single universal item, but rather to a family of uses depending on the context.

In dice and gaming, a d13 denotes a thirteen-sided die. Such dice are used in some tabletop role-playing games and board games, though they are not part of the standard polyhedral set (which typically includes d4, d6, d8, d10, d12, and d20). A d13 provides outcomes from 1 to 13 or 0 to 12, depending on the system.

In medical coding, D13 serves as a prefix in ICD-10-CM to classify benign neoplasms of connective and soft tissue. The codes with this prefix are further subdivided by site or specific characteristics, allowing granular documentation of benign growths.

In transportation and infrastructure, D13 appears as a route, service, or equipment designation in various systems. Examples include bus or rail route numbers, maintenance classifications, or model identifiers for rolling stock or signaling components. The exact meaning is determined by the issuing organization and the local context.

In technology and product naming, D13 is used as a model or variant identifier across different manufacturers and product lines. As with other alphanumeric designations, its meaning is specific to the product family and documentation from the manufacturer.

Because D13 spans several domains, understanding its meaning requires identifying the relevant field and accompanying context.