Kali Yantra. For thousands of years, yantras have been used in the Tantric tradition as visual metaphors for the body of the divine. As expressions of devotion and contemplation, they are similar to Tibetan mandalas in that meditation upon them is tantamount to returning to the primordial fiat of one’s being. Because yantras are comprised of archetypal geometric forms and shapes, they are believed to offer liberation from bondage.
Kālī - feminine form of kālam ("black, dark coloured"). Kāla means "time" and "black", being first creation before light itself. Kalika Purana depicts as "Adi Shakti" (Fundamental Power) "Para Prakriti", beyond nature. Conveys death, destruction, the consuming aspects of reality - a "forbidden thing". Transformation. Distillation of divine wrath into a goddess of salvation, who rids the sadhaka of ignorance & fear. Kali appears as a symbol of triumph over death.
Kali - the Hindu god of death and destruction, also renewal and motherhood. She is sometimes depicted with ten arms, holding a sword, and with clothes made of human hands. In one battle Kali went on a killing spree. To stop her the Lord Shiva (her husband) threw himself at her feet, she was so stunned that she stuck out her tongue. Many pictures of Kali depict her standing with one foot on Shiva's chest and her tongue sticking out. She is most often pictured as being blue or black in color.