"pin"-ren itzulpena euskara-era

fastening device; device used for fastening objects or material together; often has two components: a long body and sharp tip made of steel, or occasionally copper or brass, and a larger head often made of plastic

To fix an item, such as a library, a program shortcut, an emoticon, or a map point of interest, in a given area of the UI, so it is always accessible in that area (e.g., to make a library always visible in the navigation pane).