Meaning and elaboration
Meaning: She whose very form is Durga.
Elaboration
Durga Rupini joins "Durga," the invincible one, with "Rupini," she who takes that form. The name reveals Kali as an embodiment of Durga herself, not as a separate deity but as another manifestation of the same Supreme Shakti.
The Interconnectedness of Devi Forms This name affirms the inner unity of the Divine Feminine across her many manifestations. Kali may appear as the most fierce and transcendent form, while Durga is widely worshipped as the defender of the cosmos and the destroyer of demonic forces, yet the two are not ultimately different. It reflects the Puranic and Tantric understanding that all goddesses are forms of the one Devi.
Kali as the Primal Form of Durga In many Shakta traditions, Kali is understood as the primal source from which Durga emerges, or as the deeper power shining through Durga's form. Durga Rupini therefore means that Kali bears Durga's own force and qualities: invincibility, the destruction of evil, the defeat of forces such as Mahishasura, and the fierce maternal power that protects the worlds.
Transcendence and Protection As Durga Rupini, Kali also carries Durga's role as guardian of dharma and deliverer from distress, Durgatinashini. The name reassures devotees that Kali's terrifying appearance does not contradict her motherly grace. She protects, rescues, and watches over her children. She may be hard for the impure to approach, but to the sincere devotee she remains accessible, compassionate, and eternally protective.