They mean the lightning bolt icon, not an actual one. Image here: https://raspberrypi.stackexchange.com/questions/57963/what-does-the-lightning-bolt-mean https:

They mean the lightning bolt icon, not an actual one. Image here: https://raspberrypi.stackexchange.com/questions/57963/what-does-the-lightning-bolt-mean https://raspberrypi.stackexchange.com/questions/57963/what-d...