Start with what the Daihatsu Max is: a car with straight-three, from Daihatsu. What it meant takes a little longer.
Under the skin
The engine is straight-three. On the scales it comes to 870 kg. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
In context
Nearby in the Daihatsu catalogue sit the Daihatsu Applause and the Daihatsu Atrai.