๐๐ฟ is the dark skin tone variant of couple with heart; it is usually shown as two dark-skinned people from the shoulders up with a pink heart between them.
Couple with heart represents the closeness between partners and is frequently used to mark anniversaries, dates, or moments of shared affection. It conveys a sense of romantic connection and the happiness found in a stable partnership.
In a chat, one might say, "Happy five-year anniversary to us! ๐๐ฟ" or use it in a caption like, "Had such a wonderful evening out tonight ๐๐ฟ". It also serves well when congratulating others on their relationship or engagement.