15561559

15561559 is a seven–digit numeric identifier that appears in various cataloguing and identification systems. It is often used as an internal key in databases, a lookup code in library collections, or a unique reference within digital platforms. In the context of encyclopedic databases, 15561559 corresponds to the internal page identifier employed by Wikipedia's MediaWiki software. This numeric code is assigned to each article upon creation and remains constant even if the article’s title changes, ensuring a stable reference for bots, scripts, and cross‑referencing tools. The identifier is not typically displayed to readers; it is usually embedded in the article’s URL fragment or used in the API for data retrieval.

Apart from encyclopedic use, a similar numeric format can be found in other information systems. For example, certain archival repositories use seven‑digit accession numbers to catalogue physical or digital materials; in some countries, tax identification numbers for business entities follow a comparable length, though they are distinguished by formatting rules and checksum calculations. When encountering 15561559 outside of a web database context, it is advisable to consult the associated system’s documentation to understand its specific application, whether it denotes a person, an item, a transaction, or another categorial entity.

The persistence of such identifiers has practical benefits for interoperability. By providing a stable, system‑level key, data can be linked across disparate services without relying on mutable attributes such as names, addresses, or dates. In academic and technical environments, 15561559 would be recognized by developers and data curators as a technical reference point rather than a semantic descriptor. Efforts to map these numeric identifiers to more meaningful identifiers—such as VIAF for authors or DOIs for scholarly works—are ongoing in many open‑data initiatives, aiming to increase discoverability while preserving the concise nature of simple numeric codes.