The Grouping element aggregates or composes concepts that belong together based on some common characteristic.

The Grouping element is used to aggregate or compose an arbitrary group of concepts, which can be elements and/or relationships of the same or of different types. An Aggregation or Composition relationship is used to link the Grouping element to the grouped concepts.

Category: Other. Composite.

Example: Aggregate two Processes and an Object that together Realize a Service

Source: ArchiMate® 3.0 Specification - Chapter 4.6 Composite elements.