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The web site had the following on the web site, "The Cluster HAT Hardware Attached on Top which interfaces a Controller Raspberry Pi A B 23 with 4 Raspberry Pi Zeros configured to use USB Gadget mode is an ideal tool for teaching, testing or simulating small scale clusters." I noticed that the web site said " USB Gadget Mode Ethernet and Serial Console." They also said " Onboard 4 port USB 2. Raspberry Pi Zeros powered via Controller Pi GPIO. Individual Raspberry Pi Zero power controlled via Controller Pi GPIO. Connector for Controller Serial Console FTDI Basic." The meta header had ClusterHAT as the first optimized keyword. This keyword is followed by Raspberry Pi, Raspberry Pi Zero, and Cluster which isn't as important as ClusterHAT. The other words clusterhat.com uses is Cluster HAT.