Net label
also known as: Power flag · Named net
A name attached to a point in a schematic that connects it to every other point carrying the same name — wiring by name instead of by drawn line. +5V, GND, and SDA labels replace the spaghetti of long power wires.
In practice
Labels aren't just tidiness: they document intent (a net named CHRG_STAT explains itself) and they name nets in netlists, exports, and error messages. Rule of thumb: power and ground by label, signal flow by drawn wire — readers follow signals, they look up rails.