It represents the awakening of the Sacred Heart, which is part of the physical heart, so that unconditional love flows in and out.
Within the Prema Agni symbol, all numerology, sacred symbols and religions are represented.
The nine-pointed zigzag lightening bolt represents completion. Nine is the number of completion, and when the lightening bolts hits your heart , it is opened.
The Prema Agni can be drawn by anyone, on anyone.