ॐ क्रीं कालिकाये नमः

Kali Physical form

In Bengal and Orissa, Kali's extended tongue is widely seen as expressing embarrassment over the realization that her foot is on her husband's chest.
There are many varied depictions of the different forms of Kali. The most common form shows her with four arms and hands, showing aspects of both creation and destruction. The two right hands are often held out in blessing, one in a mudra saying "fear not" (abhayamudra), the other conferring boons. Her left hands hold a severed head and blood-covered sword. The sword severs the bondage of ignorance and ego, represented by the severed head. One interpretation of Kali's tongue is that the red tongue symbolizes the rajasic nature being conquered by the white (symbolizing sattvic) nature of the teeth. Her blackness represents that she is nirguna, beyond all qualities of nature, and transcendent.
The most widespread interpretation of Kali's extended tongue involve her embarrassment over the sudden realization that she has stepped on her husband's chest. Kali's sudden "modesty and shame" over that act is the prevalent interpretation among Oriya Hindus. The biting of the tongue conveys the emotion of lajja or modesty, an expression that is widely accepted as the emotion being expressed by Kali. In Bengal also, Kali's protruding tongue is "widely accepted... as a sign of speechless embarrassment: a gesture very common among Bengalis.
The twin earrings of Kali are small embryos. This is because Kali likes devotees who have childlike qualities in them. The forehead of Kali is seen to be as luminous as the full moon and eternally giving out ambrosia.
Kali is often shown standing with her right foot on Shiva's chest. This represents an episode where Kali was out of control on the battlefield, such that she was about to destroy the entire universe. Shiva pacified her by laying down under her foot to pacify and calm her. Shiva is sometimes shown with a blissful smile on his face. She is typically shown with a garland of severed heads, often numbering fifty. This can symbolize the letters of the Sanskrit alphabet and therefore as the primordial sound of Aum from which all creation proceeds. The severed arms which make up her skirt represent her devotee's karma that she has taken on.

Mother Nature
The name Kali means Kala or force of time. When there were neither the creation, nor the sun, the moon, the planets, and the earth, there was only darkness and everything was created from the darkness. The Dark appearance of Kali represents the darkness from which everything was born. Her complexion is black,which is more black than the darkest night ever. As she is also the goddess of Preservation, Kali is worshiped as the preserver of nature. Kali is standing calm on Shiva, her appearance represents the preservation of mother nature. Her free, long and black hair represents nature's freedom from civilization. Under the third eye of kali, the signs of both sun, moon, and fire are visible which represent the driving forces of nature. Kali is not always thought of as a Dark Goddess. Despite Kali's origins in battle, She evolved to a full-fledged symbol of Mother Nature in Her creative, nurturing and devouring aspects. She is referred to as a great and loving primordial Mother Goddess in the Hindu tantric tradition. In this aspect, as Mother Goddess, She is referred to as Kali Ma, meaning Kali Mother, and millions of Hindus revere Her as such.

There are several interpretations of the symbolism behind the commonly represented image of Kali standing on Shiva's supine form. A common interpretation is that Shiva symbolizes Purusha, the universal unchanging aspect of reality, or pure consciousness. Kali represents Prakriti, nature or matter, sometimes seen as having a feminine quality. The merging of these two qualities represent ultimate reality.

A tantric interpretation sees Shiva as consciousness and Kali as power or energy. Consciousness and energy are dependent upon each other, since Shiva depends on Shakti, or energy, in order to fulfill his role in creation, preservation, and destruction. In this view, without Shakti, Shiva is a corpse—unable to act.