Hub

noun

1. The central part, usually cylindrical, of a wheel; the nave.
2. A point where many routes meet and traffic is distributed, dispensed or diverted.

   "Hong Kong International Airport is one of the most important air traffic hubs in Asia."

3. A central facility providing a range of related services, such as a medical hub or an educational hub
4. A computer networking device connecting several Ethernet ports. See switch.
5. A stake with a nail in it, used to mark a temporary point.