There are numerous differing types of Yantras. Sri Yantra will be the strongest and celebrated of all tantric yantras. This is a representation of cosmic creation. Sri Yantra is formed by a three stage Bhupura (the sq. exterior Restrict of your Yantra) which represents the 4 elements of the head https://hectorrerdo.wikidank.com/124923/an_unbiased_view_of_yantra