Meaning and elaboration
Meaning: The self-born source of all existence.
Elaboration
The name Ātma Yoniḥ means "She whose source (Yoniḥ) is the Self (Ātma)." It expresses Kali's absolute independence and reveals her as the uncreated, primordial source of all existence.
The Ultimate Uncreated Cause Ātma Yoniḥ declares that she is not born from anything or anyone else. She is the ultimate self-existent cause (Kāraṇa) from which all things arise. Her source is none other than her own essential being, her own Self (Ātman). In this way, she stands apart from all created things, which depend on some prior cause for their existence.
The Primordial Womb/Source The term Yoniḥ can mean womb or source. As Ātma Yoniḥ, she is the self-manifesting womb of the cosmos, the primal energy (Ādi-Parāshakti) from whom the universe emerges from within herself. This points to an infinite power of creation and manifestation, all proceeding from her own essence.
Non-dual Nature This name also emphasizes her non-dual (Advaita) nature. Since she is her own source, the final distinction between creator and creation, or between source and emanation, falls away at the highest level. She is Brahman, the Absolute Reality, in its dynamic and manifesting aspect, where the Self is not different from the All. For the devotee, contemplating Kali as Ātma Yoniḥ can open the recognition that the Self within is fundamentally one with this cosmic, self-existent source.