Why do power cables sometimes need a third pin called “ground”? I thought one pin was positive voltage and the second was ground. Why would there be 2 ground pins? - Quora
Fix some USB com errors with proper electrical grounding - Guides - OctoPrint Community Forum
Each Load cell requires four GPIO pins for power, ground, data... | Download Scientific Diagram
Why does the PATA power connector have two ground connectors instead of a shared one? - Quora
What is the importance of separate power and logic ground (ie a Vss pin) in gate driver - Electrical Engineering Stack Exchange