This character is a Otro símbolo and is commonly used, that is, in no specific script. El carácter es también conocido como mermaid y merman.
The glyph is not a composition. Its East Asian Width is wide. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. U+1F9DC prohibits a line break after it, if it’s followed by an emoji modifier.
The CLDR project calls this character “persona sirena” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: sirena, tritón.
This character is designated as an emoji. It will be rendered as colorful emoji on conforming platforms. To reduce it to a monochrome character, you can combine it with Variation Selector-15: 🧜︎ Se puede modificar la apariencia del carácter si se le añade un modificador de emoyi. See the Emojipedia for more details on this character’s emoji properties.
El Wikipedia tiene la siguiente información acerca de este punto de código:
Merfolks, Mercreatures, Mermen or Merpeople are legendary water-dwelling human-like beings. They are attested in folklore and mythology throughout the ages in various parts of the world.
Female merfolks are called mermaids, although in a strict sense mermaids are confined to beings who are half-woman and half-fish in appearance. Male merfolks are called mermen. Depending on the story, they can be described as either ugly or beautiful.
Chinese renyu (人魚) stands for "merfolks", but in ancient geographical or natural historical tracts, this referred to "human-fish" or "man-fish" purported to inhabit rivers or lakes in certain parts of China. Japanese ningyo (人魚) is also "merfolks" and also applied to various human-like fish recorded in writings from medieval times into the Edo Period.