The Free On-line Dictionary of Computing (30 December 2018):

hub
hubs

    (By analogy with the hub of a wheel) A device
   connected to several other devices.

   In ARCnet, a hub is used to connect several computers
   together.  In a message handling service, a number of local
   computers might exchange messages solely with a hub computer.
   The hub would be responsible for exchanging messages with
   other hubs and non-local computers.

   (1995-01-16)