5F

5F is an alphanumeric designation used in multiple domains to label a level, variant, or code. The most common usage is in building or facility signage, where 5F denotes the fifth floor. In elevator panels and directories, the letter F typically stands for floor, with numbers indicating the level; 5F is the label used for the fifth floor, while prefixes such as B1F or 1F extend the same convention to basements or ground floors as appropriate. This usage is widespread in offices, shopping centers, and transit hubs, especially in East Asia and other regions where bilingual or multilingual signage is common.

In manufacturing, electronics, and logistics, 5F may appear as part of a model number, variant code, or batch identifier. In these domains, the meaning of 5F is specific to the product family and documentation rather than a universal code.

In media and culture, 5F can be used as a fictional location code, event label, or shorthand within a title or storyline. As with other alphanumeric labels, its interpretation depends on context and accompanying information.

See also: floor numbering systems; alphanumeric labeling conventions; product codes.