The Shield (Star) of David's Tree of Life
It contains twelve triangles parallel to the 12 tribes of Israel. Within each triangle is a tree of life; a tree of six points of power: Hesed, compassion - the power of 'Yes'; G'vurah, discipline - the power of 'No'; Tiferet, beauty - the power of harmony and balance; Netsah - perseverance; Hod - gratitude; Y'sod, foundation - truthfulness. These are the powers that draw blessings into the world.
All the triangles together form seventy-two points of power, as the seventy-two holy names of God. The inner six triangles form the flower of life.