The symbolism is associated with Anuttarayoga tantra and, while there are various interpretations of the symbolism in the twilight language, the male figure is usually linked to compassion (karuṇā) and skillful means (upāya-kauśalya), while the female partner to 'insight' (prajñā). The symbolism of union and sexual polarity is a central teaching Tantric Buddhism, especially in Tibet. The union is realised by the practitioner as a mystical experience within one's own body. Yab-yum may also be represented through the aniconic signification of yantra and mandala.