The Mermaid: Medium-Dark Skin Tone emoji is a ZWJ sequence combining ? Merperson, ? Medium-Dark Skin Tone, Zero Width Joiner and ♀️ Female Sign. These display as a single emoji on supported platforms.
Mermaid: Medium-Dark Skin Tone was added to Emoji 5.0 in 2017.
U+1F9DC
U+1F3FE
U+200D
U+2640
U+FE0F
??♀️ Merperson
??♀️ Emoji modifier fitzpatrick type-5
??♀️ Zero width joiner
??♀️ Female sign
??♀️ Variation selector-16