Sölueiningum
Sölueiningum is a term that translates from Icelandic to "sales units." It refers to the fundamental quantities in which a product or service is sold. The specific nature of a sölueining is highly dependent on the item being transacted. For tangible goods, a sölueining is typically a single physical item, such as a bottle of water, a book, or a car. In other cases, it might be a package or a multi-pack, where the unit is defined as a collection of individual items sold together, like a six-pack of soda or a box of cereal.
For services, the concept of a sölueining can be more abstract. It could represent a specific duration