A South Indian depiction of Maan Kali
Kali's most common four armed iconographic image shows each hand carrying variously a sword, a trishul (trident), a severed head and a bowl or skull-cup (kapala) catching the blood of the severed head.
Two of these hands (usually the left) are holding a sword and a severed head. The Sword signifies Divine Knowledge and the Human Head signifies human Ego which must be slain by Divine Knowledge in order to attain Moksha. The other two hands (usually the right) are in the abhaya (fearlessness) and varada (blessing) mudras, which means her initiated devotees (or anyone worshiping her with a true heart) will be saved as she will guide them here and in the hereafter
She has a garland consisting of human heads, variously enumerated at 108 (an auspicious number in Hinduism and the number of countable beads on a Japa Mala or rosary for repetition of Mantras) or 51, which represents Varnamala or the Garland of letters of the Sanskrit alphabet, Devanagari. Hindus believe Sanskrit is a language of dynamism, and each of these letters represents a form of energy, or a form of Kali. Therefore she is generally seen as the mother of language, and all mantras
She is often depicted naked which symbolizes her being beyond the covering of Maya since she is pure (nirguna) being-consciousness-bliss and far above prakriti. She is shown as very dark as she is brahman in its supreme unmanifest state. She has no permanent qualities — she will continue to exist even when the universe ends. It is therefore believed that the concepts of color, light, good, bad do not apply to her — she is the pure, un-manifested energy, the Adi-shakti"