N18

N18 is an alphanumeric designation used in multiple domains to label roads, products, and identifiers. The prefix N is commonly used in road classification schemes to denote national or local networks, as opposed to metropolitan or regional designations.

In transport, the best-known use of N18 is as the designation of the N18 road in the Republic of Ireland, a national primary route that connects Limerick and Galway and links with other major corridors. The route passes through rural counties and serves as an important arterial link between the midwest and the west of the country. In some contexts, segments of this corridor are being upgraded or maintained as motorways, with the motorway designation M18 applied to portions while the legacy route remains as N18.

In technology and consumer goods, N18 appears as model numbers or part identifiers assigned by manufacturers. Examples include electronic components, audio equipment, and automotive parts, among others. These uses are defined by the issuing company and are not standardized across industries.

In research, data projects, or software labeling, N18 may label a version, dataset, configuration, or project code. The exact meaning is determined by the project’s naming conventions.

Overall, N18 functions as a flexible label whose meaning is determined by context, with road networks being one of the most recognizable applications, alongside various manufacturer and project-specific uses.