This character is a Otro símbolo and is commonly used, that is, in no specific script.
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+1F91F prohibits a line break after it, if it’s followed by an emoji modifier.
The CLDR project calls this character “gesto de te quiero” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: mano, quiero.
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:
The ILY is a sign from American Sign Language which, as a gesture, has moved into the mainstream. Seen primarily in the United States and other Americanized countries, the sign originated among deaf schoolchildren using American Sign Language to create a sign from a combination of the signs for the letters I, L, and Y (I Love You).
The sign is an informal expression of any of several positive feelings, ranging from general esteem to love, for the recipient of the sign. A similar-looking but unrelated variation in which the thumb is toward the palm appears in heavy metal music culture as a "horns" hand-sign (though the thumbs extended version is sometimes used) and in college football as a sign of support for various teams including the University of Texas. The University of Louisiana at Lafayette's Ragin' Cajuns Athletics uses the ILY sign to symbolize the initials of the university (UL).