INA219 current sensor

Hi guys, I have a question.

A precision amplifier measures the voltage across the 0.1 ohm, 1% sense resistor. Since the amplifier maximum input difference is ±320mV this means it can measure up to ±3.2 Amps. With the internal 12 bit ADC, the resolution at ±3.2A range is 0.8mA. With the internal gain set at the minimum of div8, the max current is ±400mA and the resolution is 0.1mA.

What is the meaning of div8 ?

The INA219 has four programmable gain (PGA) settings. See page3 of the datasheet.
I think they made a mistake in the sentence you're quoting, because according to the datasheet "PGA = ÷ 1" has the most gain, and "PGA = ÷ 8" is default (±3.2A with a 0.1ohm shunt).
PGA can be changed in setup().