Has many different use the most common is used by people of color kinda
like BLM ( I support) but is also used by goth and
emos for Emo's it's used to show appreciation and a sign they don't want to talk right now, for Goths, well it depends on the Goth person if the Goth person who sent this is more negative then it's highly unlikely you'd see them send you this but it means they want you to
shut up and they are upset but not at the specific person if you are important
like a friend or lover(π€...) if the Goth who sent you this is more positive it means the same as red heart sent to a close friend or lover the Goth is just bias to the black.