2. Sanskrit term meaning "Conception instrument." A geometric-style of diagram from Tantric philosophy used for concentration and in ritual to represent and contain specific psychic energies. Meditation on the Yantra will induce specific consciousness experiences.
The prefix yan- means "to conceive, perceive, imagine, visualize," and the suffix -tra equals an "instrument, implement or tool." Hence, a yantra is a tool for focusing the mind and encouraging clarity of conception.