Like the Sephiroth from which it emanates, every soul has ten potencies, consisting of a trinity of triads.
Kant puts together, as belonging to " Rational Theology," three arguments - he is critic of fond of triads, though they have not the significance for him which they came to have for Hegel.
As the three triads respectively represent intellectual, moral and physical qualities, the first is called the Intellectual, the second the Moral or Sensuous, and the third the Material World.
In most color monitors the dots are built of triads, groups of three phosphor dots, one for Red, Green and Blue.
A body of work known collectively as the Four Ancient Books contains collections of short items arranged in threes, called the Welsh triads.