Perimeter is a too generic word. In general, it comes from US Army, and it marks a territory protected by soldiers. For example, we can have a "network perimeter" in IT. It is usually the internal network behind the firewall. Everything behind the firewall and security checks is "inside the perimeter", and the rest is "outside of the perimeter".
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The mesh is a collection of nodes, a lighthouse, and an admin center. The user device is a node, a server is a node, cloud stack is a node, LAN access box is a node.
