In IBM® Rational® Rhapsody®, nodes represent UML node instances.
The graphical symbol for a node in the UML is a three-dimensional cube with a name, such as the name of a processor.

You can create a node using the Node tool, the Edit menu, or the Rational Rhapsody browser.
in Diagram Tools.You can click-and‑drag any node that exists in the browser to add it to a deployment diagram.