NACS supports either one or two phases for AC charging which would be used in most home chargers. A really high power charger would use DC with the AC/DC conversion happening before (and that could be from a three-phase source)

What the US has is split phase power, when one phase is 240V and that is split to make two 120V legs. NACS supports single phase power, either 120V (Level 1) or 240V (Level 2).

There is no such thing as two-phase power, there is single-phase or three-phase. Since three-phase is better than two-phase.

You can look at it either way. "Phase" literally means the offset of the waveforms. With 3-phase, each of the phases is 120° out of sync. With split phase, you can look at it as a single, 240V phase with neutral in the middle, allowing it to be split into two 120V halves. Or you could look at it as two 120V phases, 180° out of sync, such that the difference between them is therefore 240V.

> NACS supports either one or two phases for AC charging which would be used in most home chargers.

Lots of european homes have 3-phase service. I have 3-phase 400V in my flat.