A Tamil depiction of Kali
Classic depictions of Kali share several features, as follows:
Kali's most common four armed iconographic image shows each hand carrying variously a crescent-shaped sword or a giant sickle, a Trishul (trident), a severed head, and a bowl or skull-cup (Kapala) collecting 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 Varda (blessing) Mudras, which means her initiated devotees (or anyone worshipping 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 dyanmism, 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.
Mahakali (Sanskrit Mahākālī, Devanagari महाकाली), literally translated as "Great Kali," is sometimes considered as a greater form of Kali, identified with the Ultimate reality of Brahman. It can also be used as an honorific of the Goddess Kali, signifying her greatness by the prefix "Mahā-". Mahakali, in Sanskrit, is etymologically the feminized variant of Mahakal or Great Time (which is interpreted also as Death), an epithet of the God Shiva in Hinduism. Mahakali is the presiding Goddess of the first episode of the Devi Mahatmya. Here, she is depicted as Devi in her universal form as Shakti. Here Devi serves as the agent who allows the cosmic order to be restored.
Kali is depicted in the Mahakali form as having ten heads, ten arms, and ten legs. Each of her ten hands is carrying a various implement which varies in different accounts, but each of these represents the power of one of the Devas or Hindu Gods and are often the identifying weapon or ritual item of a given Deva. The implication is that Mahakali subsumes and is responsible for the powers that these deities possess and this is in line with the interpretation that Mahakali is identical with Brahman. While not displaying ten heads, an "ekamukhi" or one headed image may be displayed with ten arms, signifying the same concept: the powers of the various Gods come only through her grace.