A nero is a near zero or near zero mileage day. When you complete some mileage, but not very much then you’ve done a nero. For example, a few days ago I did a nero on the day I got to Kennedy Meadows. That day I only did four miles. For the rest of the day I relaxed, talked with other hikers, did my resupply, had a shower, drank 4 cokes, and ate an enormous double cheeseburger. That night I slept in the area behind the general store and left the next morning.