ཡབ-ཡུམ Yab-Yum, songe d'un matin d'hiver

चक्रसमावरा हेरुका Chakrasamvara Heruka (Father) in YabYum union with वाजरेयुमिनी Vajrayogini (Mother) symbolizes the union of compassion & wisdom.

Wedding of a princess & I, an apparent redeemer (of Her'/Ἥρα, Hḗra, the goddess of women, marriage, family and childbirth in ancient Greek religion and mythology, one of the Twelve Olympians and the sister and wife of Ζεύς • (Zeús, m, genitive Διός). She is the daughter of the Titans Cronus and Rhea. Hera rules over Mount Olympus as the queen of the gods. A matronly figure, Hera served as both the patroness and protectress of married women, presiding over weddings and blessing marital unions. One of Hera's defining characteristics is her jealous and vengeful nature against Zeus' numerous lovers and illegitimate offspring, as well as the mortals who cross her.).

➥ union/coalescence of the dorsal vagal, sympathetic & ventral vagal ("Polyvagal Theory" of the three neural (of or relating to nerves or the nervous system) circuits).

Vajrasattva (वज्रसत्त्व) refers to one of the Dhyāni-Buddhas, according to Vajrayāna or Tantric Buddhism.—His Śakti, or female counterpart (spiritual consort) is named Vajrasattvātmikā and their Bodhisattva offspring is named Ghaṇṭāpāṇi.—His colour is white; his symbol is the vajra and ghaṇṭā/Ghaṇṭā (घण्टा, “shining, splendid”, bell).—Vajrasattva, the Sixth Dhyāni Buddha, is regarded by the Nepal Buddhists as the priest of the Five Dhyāni Buddhas. He is not represented in the Stūpa like the other Dhyāni Buddhas, but independent shrines are dedicated to his worship. His worship is always performed in secret and is not open to those who are not initiated into the mysteries of Vajrayāna. Vajrasattva is represented in two forms, single and Yab-yum.

Vajrasattva is described in the Advayavajrasaṃgraha:—“Vajrasattva originates from the syllable HŪṂ and is white in colour. He is two-armed and one-faced and holds in his two hands the Vajra and Vajra-marked Ghaṇṭā. He represents the astringent taste, the Autumn season, the letters of the alphabet ya, ra, la, and va, and the part of the night from midnight to day-break. His second name is Dharmadhātu”.

When represented singly, he is exhibited before the public. The Yab-yum form is generally kept secret. When represented in Yab-yum, he is closely associated with his Śakti who is generally known as Vajrasattvātmikā. He carries the Vajra and the Ghaṇṭā in the same manner as when single, but the Śakti holds the Kartri in the right hand and the Kapāla in the left.

Hieros Gamos, Pompeii

Hieros gamos or Hierogamy (Greek ἱερὸς γάμος, ἱερογαμία "holy marriage") is a sacred marriage that plays out between a god and a goddess, especially when enacted in a symbolic ritual where human participants represent the deities.

The notion of hieros gamos does not always presuppose literal sexual intercourse in ritual but is also used in a purely symbolic or mythological context, notably in alchemy and hence in Jungian psychology.

In Tantric Buddhism of Nepal, Bhutan, India and Tibet, ཡབ-ཡུམ yab-yum (literally, "father-mother" 歡喜佛（梵語：Nandikeśvara，直譯：歡喜自在（主）），又稱雙身佛（藏文：ཡབ-ཡུམ Yab-Yum，父母）) is a ritual of the male deity in union with a female deity as his consort. The symbolism is associated with अनुत्तर योग (yóga) Anuttarayoga tantra where the male figure is usually linked to compassion (karuṇā) and skilful means (उपाय कौशल्य, upāya-kauśalya, expedient means, pedagogy+cleverness, 方便) & the female partner to 'insight' (prajñā). Yab-yum is generally understood to represent the primordial (or mystical) union of wisdom and compassion.

मैथुन, Maithuna is a Sanskrit term used in Tantra most often translated as a sexual union in a ritual context. It is the most important of the five मकर Makara ― that appear as वाहन, the vahana (vehicle, Vāhanam or animal vehicle, literally "that which carries, that which pulls") of the river goddess Ganga, Narmada and of the sea god Varuna. Makara are considered guardians of gateways and thresholds, protecting throne rooms as well as entryways to temples; it is the most commonly recurring creature in Hindu and Buddhist temple iconography, and also frequently appears as a Gargoyle or as a spout attached to a natural spring ― and constitutes the main part of the Grand Ritual of Tantra variously known as पंचमकार Panchamakara [Five Ms, is तांत्रिक the Tantric term for the five transgressive substances used in तांत्रिक a Tantric practice. These are मद्य madya (alcohol), मासा māṃsa (meat), मत्स्य Matsya (fish), मुद्रा mudrā (gesture) & मैथुना maithuna (sexual intercourse)], पंचतत्त्व Panchatattva (5 Truths/Elements), and Tattva Chakra.

The symbolism of union and polarity is a central teaching in Tantric Buddhism, especially in Tibet. The union is realized by the practitioner as a mystical experience within one's own body.

Alchemy & Jungian psychology (Lapis philosophorum & Holy Grail)

The hieros gamos is one of the themes that Carl Jung dealt with in his book Symbols of Transformation.