One could also describe the three as Self, anima and body

Psychology of Yoga and Meditation

Stupas are hemispheric central structures, graves, with three parasols one above the other, representing the three worlds, namely:

dharmakâya (i.e., the purely spiritual world, the world of absolute truth), sambhoga kâya (i.e., the intermediate world, the world of subtle bodies) and the nirvana kâya (i.e., the world of objects, the world of created things).

One could also describe the three as Self, anima and body. ~Carl Jung, Psychology of Yoga and Meditation, Page 52

Tantra means book, a leaf of paper or weaving loom.

It is used for educational books or text books utilized for this special purpose. In its whole style Tantrism corresponds to the scholasticism of our Western culture.

It plays a very great role in Tibetan Buddhism.

They have a particular yoga, described as Kundalini Yoga or Serpent Fire Yoga.

But this is Hindu, not Buddhist. ~Carl Jung, Psychology of Yoga and Meditation, Page 56

Lamaistisches Vajramandala.

This Yantra was used by Jung and Wilhelm as frontispiece to The Secret of the Golden Flower (Wilhelm & Jung, 1929); also in Jung, 1944, fig. 43; Jung, 1950, fig. 1 and §§ 630–638. Jung also presented it at the seminar on dream analysis on 19 February 1930 (Jung, 1928–1930, p. 479).

The image was part of a greater number Jung collected, which he presented in his seminar series in Berlin in 1933.  ~Carl Jung, Psychology of Yoga and Meditation, Page 57 Image 94

the âtman is the absolute origin of being.

The particular: that he is not only the universal being like that of the highest Buddha, the essence of the world itself, but he is also a personal being. Everyone has a personal Self, this âtman within, but this is only one aspect of the universal.

Whoever immerses himself in the practice of yoga, flows in a way out of the personal âtman into the general, and then considers himself a universal being. ~Carl Jung, Psychology of Yoga and Meditation, Page 62