a21

A21 is a designation used across several domains to label routes, organizations, products, and other identifiers. It does not refer to a single entity, but rather to a set of distinct uses that share the same alphanumeric code. The meaning of A21 depends on the context in which it appears, including geography, industry, and the organization or product involved.

In transportation, A21 is a road or motorway designation used in multiple countries to label major routes within national or regional networks. The exact route designated as A21 varies by country, and the road’s length, endpoints, and governance depend on the local transportation authority. As with other A-prefix roads, A21 routes often serve as important connectors between towns and cities, or as links along coastlines or inland corridors.

Beyond infrastructure, A21 also appears in corporate and organizational names as well as product identifiers. For example, the A21 Campaign is a nonprofit organization focused on combating human trafficking and supporting survivors. AI21 Labs, an Israeli technology company, uses a stylized AI21 in its branding and develops advanced language models and writing tools. In manufacturing and electronics, A21 can function as a model number or product code used by various manufacturers to distinguish specific devices, components, or generations within a product line.