Two-Phase has two legs, 90 degrees apart. When one phase is at maximum amplitude the other phase will be at zero.
Split Phase is 180 degrees apart. When one leg is at maximum positive amplitude, the other will be at maximum negative amplitude. When either is crossing zero, the other is also crossing zero, in the opposite direction.
US has two phase power in residential households
Split phase, not two phase.
Two-Phase has two legs, 90 degrees apart. When one phase is at maximum amplitude the other phase will be at zero.
Split Phase is 180 degrees apart. When one leg is at maximum positive amplitude, the other will be at maximum negative amplitude. When either is crossing zero, the other is also crossing zero, in the opposite direction.