I mean when they put parts down on the schematic and just attach net names to them. You know, the pull-up resistors in the corner with named nets on them, not shown attached to particular pins or buses. Usually with a dotted box drawn around them. Frequently horizontal.

Also usually totally implicit power routing. And no one that draws schematics that way has ever learned the value of drawing IC symbols to fit the circuit as opposed to the physical pinning of the device.