Meaning
A heavy red heart sitting on top of a dot, so it doubles as an exclamation mark. It adds emphatic love or enthusiasm, a heartfelt “!” at the end of a sentence.
Use it where you would normally put an exclamation point but want to sound warmer: “Thank you for the flowers ❣️” It suits thank-yous, strong agreement and cheerful announcements. Because it looks like punctuation, some readers might skim past it, and on devices that show the text style it can appear as a small plain symbol.