Kali represents the disintegrative force in nature as displayed in the passage of time and an increase in entropy. Kali is symbolized in the yantra as black. The downward pointing triangle is the ancient symbol of the primal female, the origin of all things – the pubic triangle of the Great Goddess.
Sri Yantra represents visually the replication of the “genetic code” of the first triangle in the process of creation of the multiform universe in all its complexity
Jai Singh is claimed to have devised the Samrat Yantra, the Jaiprakash, and the Ram Yantra. These three instruments are indeed peculiar to his Observatorries, and must be to some extent attributed to his personal ingenuity.
Perhaps the best-known mandala-cum-plotting device in the Tantric universe is the Sri Cakra and Sri Yantra of Hindu Tantric practice, a perfectly balanced three-dimensional geometric diagram of a series of eleven interlocking and embedded triangles (also called Cakras) radiating downward and outward from a central point and enclosed by a circle and a square. The mandalas of Buddhist and Jain Tantric practice follow similar structural and dynamic principles.
Yantra is an instrument designed to curb the psychic powers by concentrating them on pattern, and in such a way that this pattern becomes reproduced by the worshipper’s visualizing powers.Heinrich Robert Zimmer
Yantra is an instrument of fastening.
Brunner defines Yantra as a linear representation on a specific surface, such as birch-bark… yantras almost inevitably have letters, seed (beeja) syllables or mantras inscribed in them….yantras have inscribed mantras.
The Sri Yantra is composed of two sets of triangles. One set includes four male triangles denoting the four aspects of evolved or limited consciousness. The other set includes five female triangles denoting the five vital functions, the five senses of knowledge, the five senses of action, and the five subtle and five physical forms of matter.
...when the Goddess is invited to take her place, before the moment of worship, the yoni mudra is made since the yoni , the female organ is her pitha or Yantra. The yoni can never be regarded by Tantric adept otherwise than an altar.
By regularly meditating on a specific Yantra, you can tune in to the corresponding archtype to focus its healing energies in your psyche and foster personal growth.
Because it restrains all suffering arising from the defects (in the form) of desire, anger and so forth they call it Yantra. The god who is worshipped in it graces (the practitioner)
O Mistress of the kula, because it protects always from absolutely all dangers, such as Yama and (evil) spirits (bhuta), therefore it is called Yantra.
It subdues all evil , it protects the practitioner from great danger when worshipped (and) visualized ( dhyana ); therefore it is called Yantra.
They call it Yantra because it restrains prolonged suffering arising from defects (in the form) of desire, anger and so forth.
Texts may prescribe that the lines of the Yantra be traced with a specific colour, for example, with turmeric or blood, but the space inside is never filled with colours….images are generally not found in yantras.
These two sets of triangles are superimposed to show the union of the masculine and feminine aspects of your nature. When united they make the eight lotus petals of the Yantra. Four gates or doors called bhupara, surround these triangles representing the gates of the consciousness to the deeper mysteries beyond.
The Kali Yantra is invoked when you are dealing with a major life crisis or trauma. It activates the latent code of Kali for the purpose of survival and mastery of an overwhelming situation....The mantra to guide your consciousness through the Kali Yantra meditation is Om Kareeng Kalekaye Namah , which means “Salutations to Goddess Kali”.Ashok Bedi