A type of Ethernet hub that can be expanded by daisy chaining additional hubs together via dedicated ports for that purpose. They are designed to stack vertically and be treated as a single domain by the network management software.
AsanteFAST Stackable Hubs
These stackable Fast Ethernet hubs from Asante plug directly into each other, eliminating the cables normally used to daisy chain hubs together. (Image courtesy of Asante Technologies, Inc.)