Backbone

The backbone is a synonym for the spine of a vertebrate organism.
Backbone is used colloquially for "courage".
In telecommunications and computer science, the term backbone has the following meanings:
The high-traffic-density connectivity portion of any communications network.
In packet-switched networks, a primary forward-direction path traced sequentially through two or more major relay or switching stations.: primarily switches and interswitch trunks. (Source: from Federal Standard 1037C and from MIL-STD-188)
The Internet backbone.
In transportation backbone has a similar meaning. More generally it is the most important part.

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