Page 31, Column 2, Paragraph(s) 10, Core Rule Book
Root: The portion of the central server where the Corporation installs upgrades.

The root is the part of a central server in which upgrades can be installed, as distinct from the rest of the cards that make up the central servers.

Page 6, Column 2, Paragraph(s) 5, Core Rule Book

This is the area of a central server where upgrades for the server are installed. When an upgrade is installed in the root, it should be placed below the server. If a root has no cards installed in it, it is considered to be empty.

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