Ground symbol
Ground: every ground symbol (and every net label named GND) is the same node, the 0 V that voltages are measured from. SPICE export calls it node 0. It exists only in the drawing: on a real board it is the negative or common wire.

Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
Pins
- ground
Lessons and builds that use it
- Grounding, bonding and surge protection: the two jobs of earth
- Commissioning and troubleshooting: the checklist and the fault
- Exam: this system fails on cold mornings