Shri Sodashi Yantra Pendant

Tripura sundari or shodashi is believed to have taken birth to save the gods from the ravages of a mighty and wrathful demon. the word 'shodashi' literally means sixteen in sanskrit. She is thus visualized as sweet girl of sixteen. In human life sixteen years represent the age of accomplished perfection after which decline sets in.
Indeed sixteen days form the completed lunar cycle from the new moon to the full moon. The full moon is the moon of sixteen days. This girl of sixteen rules over all that is perfect, complete, beautiful.
Once upon a time shiva referred to kali (his wife) by her name in front of some heavenly damsels who had come to visit, calling her "kali, kali" ("blackie, blackie") in jest.this she took to be a slur against her dark complexion. She left shiva and resolved to rid herself of her dark complexion, through asceticism.
Later, the sage narada, seeing shiva alone, asked where his wife was. Shiva complained that she had abandoned him and vanished.
With his yogic powers narada discovered kali living north of mount sumeru and went there to see if he could convince her to return to shiva.
Narada told her that shiva was thinking of marrying another goddess and that she should return at once to prevent this. By now kali had rid herself of her dark complexion but did not yet realize it. Arriving in the presence of shiva, she saw a reflection of herself with a light complexion in shiva's heart.
Thinking, that this was another goddess, she became jealous and angry. Shiva advised her to look more carefully, with the eye of knowledge, telling her that what she saw in his heart was herself. The story ends with shiva saying to the transformed kali: "as you have assumed a very beautiful form, beautiful in the three worlds, your name will be tripura- sundari. You shall always remain sixteen years old and be called by the name shodashi."