Drawing power from a USB connection.  Launched in 2007, USB Battery Charging was the first USB power specification.  Battery Charging was fixed at 7.5 watts, 5 volts and 1.5 amps.  See 
USB Battery Charging and 
poweredUSB.
USB Power Delivery (USB PD)
In 2012, USB Power Delivery was introduced by the USB Implementer's Forum (USB-IF).  USB PD enables charger and receiver to negotiate the required power, which increased from 7.5 to 240 watts by 2021.  See also 
poweredUSB.
     Power Delivery Over USB-C Cables
        Watts   Volts  Amps
          15      5     3
         100     20     5
         240      5     5
PD Battery Logos
These logos indicate that the USB port supports Power Delivery.  The numbers are the SuperSpeed version (see 
USB).