j4

J4 is an alphanumeric designation used in several independent domains to label distinct objects, products, or policies. Because it spans different fields, the meaning of J4 is determined by context and is not tied to a single canonical entity.

In consumer electronics, Galaxy J4 refers to a 2018 budget smartphone produced by Samsung Electronics as part of the Galaxy J series. The device followed earlier J-series models and was positioned to provide essential features at a low price point. The Galaxy J4 line has since been supplanted by newer Samsung lines, with later iterations adopting different naming conventions.

In immigration policy, J-4 is the visa category for dependents of J-1 exchange visitors in the United States. J-4 status allows spouses and children to accompany the J-1 holder. Work authorization for J-4 dependents requires a separate employment authorization process, subject to applicable U.S. immigration rules.

Other uses of J4 exist in transportation and product naming, where it may designate a specific route, model, or version in a locality or company system. These uses are highly context-dependent and vary by country and organization.