Avalokiteshvara - Rangjung Yeshe Wiki - Dharma Dictionary

The absence of distinction between śūnyatā and compassion is known as bodhicitta.”96 The heruka and consort in union are the Vajrayāna expression of awakened heart, bodhicitta.
Judith Simmer-Brown • Dakini's Warm Breath: The Feminine Principle in Tibetan Buddhism
Relative bodhicitta, which arises out of love and compassion, is the aspiration to attain enlightenment for the benefit of all sentient beings. Absolute bodhicitta is the direct insight into the empty nature of all phenomena.