The Man Firefighter: Dark Skin Tone emoji is a ZWJ sequence combining ? Man, ? Dark Skin Tone, Zero Width Joiner and ? Fire Engine. These display as a single emoji on supported platforms.
Man Firefighter: Dark Skin Tone was added to Emoji 4.0 in 2016.
U+1F468
U+1F3FF
U+200D
U+1F692
??? Man
??? Emoji modifier fitzpatrick type-6
??? Zero width joiner
??? Fire engine