This is a black heart, it is cold, ruthless, and has black humor. When it indicates sadness and sorrow, it is often used with
⚱ a funeral urn,
🙏 folded hands,
⚰ coffin, and
😔 pensive face, and it is often added when expressing R.I.P. (Rest In Peace). It can also represent the Gothic style and dark Lolita that young girls like. Related emojis:
❤🧡💛💚💙💜🤎🤍❣