E21

E21 is a designation used in several different contexts, including automotive engineering and the international road network.

In automotive design, the BMW E21 refers to the first generation of the BMW 3 Series, produced from 1975 to 1983. It established the compact executive sedan’s reputation for balanced handling and everyday practicality. The E21 offered four- and six-cylinder engines and was produced in multiple body styles, with various trim levels to suit different markets and preferences.

In the European road network, the E21 is a designated route of the international E-road system. The E-road network is coordinated by the United Nations Economic Commission for Europe (UNECE) and connects multiple countries through standardized signage. The E21 designation is used to identify a specific corridor within this system, illustrating how Europe organizes major cross-border routes under a common numbering scheme.

Beyond these uses, E21 may appear as a model or product code in other industries. In each case, its meaning depends on the organizational context and should be interpreted accordingly.