In a broader sense, it is our feeling. There are many expressions with Heart: A heart of gold - heart in the right place - Your heart lose to someone - a special place in my heart - your heart give to someone - A fragile heart, etc.
1 The physical or physical heart with its ethereal counterpart that vivified.
2 The heart chakra: the center of a system of seven power centers (chakras) which relates to include the interaction with others, the right to love and be loved, and social identity.
3 immortal spiritual core in the human system (microcosm), which is also referred to as primeval atom, spirit spark, divine spark.