C15

C15 is a designation used in multiple disciplines to denote a 15-carbon construct or item in a sequence, and there is no single, universal definition. The meaning varies by field and is often context dependent.

In chemistry, C15 commonly denotes a molecule with fifteen carbon atoms. It is used as a shorthand for a carbon skeleton length in hydrocarbons and polymers. The straight-chain alkane with fifteen carbons is pentadecane, with the chemical formula C15H32. In polymer contexts, Cn often describes the approximate length of carbon chains in molecules or materials.

In medical coding, C15 is the ICD-10 code for malignant neoplasm of the esophagus. This coding is used for diagnosis classification in clinical records, billing, and epidemiological tracking. Codes in the C00–C97 range cover malignant neoplasms, with C15 specifically allocated to the esophagus.

In electronics and manufacturing, C15 can appear as a reference designator on schematics or circuit boards, identifying a specific capacitor in a list of parts. It is a label used during design and assembly, not a property of the component itself.

In other contexts, C15 may appear in product names, model numbers, or course codes, where its meaning is defined by the organization or domain that assigns it.