HD3

HD3 is an alphanumeric designation used in various fields to label items, projects, or identifiers. There is no single, universal meaning for HD3, and its interpretation depends on the discipline and context.

In astronomy, HD designations are assigned to stars in the Henry Draper Catalogue. When used, HD 3 would refer to the third entry in that catalog, though the properties of that object depend on the catalog data.

In computing and consumer electronics, HD3 has been used as a model name, variant code, or release identifier for devices or software. Such use typically signals a third generation or an incremental revision, but the precise features are determined by the manufacturer.

In biology and medicine, HD3 may appear as a gene symbol, locus label, or experimental designation within a study. Because gene and project identifiers are often field- and species-specific, the exact meaning of HD3 must be inferred from accompanying documentation.

In other domains it can serve as a project code, stock-keeping identifier, or catalog entry.