Why does the NewRelic node.js driver allows multiple application names?

Question

Based on this function, the node.js newrelic driver allows multiple application names. Why does it allow this?

Answer 1

Newrelic allows you to use up to three names per application so that you can create groupings that are meaningful to your troubleshooting and environment.

This is explained in the node.js agents config

Also in New Relic's documentation here and here.