In system designs, it's common to use a set of overlapping boxes to represent a collection of things. PlantUML supports this... but only for sequence diagrams. :(
Could we get this shape available to others -- especially deployment?
Example of today's support:
http://www.plantuml.com/plantuml/png/SoWkIImgAStDuKhEpyb9JIx9pCyhLd3BptTABE9oICrB0Ka10000