This character is a Other Symbol 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+1F9D4 prohibits a line break after it, if it’s followed by an emoji modifier.
The CLDR project calls this character “person: beard” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: beard, bearded, person, whiskers.
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: 🧔︎ The character can be changed in appearance, if it is followed by an emoji modifier. See the Emojipedia for more details on this character’s emoji properties.
The Wikipedia has the following information about this codepoint:
A beard is the hair that grows on the jaw, chin, upper lip, lower lip, cheeks, and neck of humans and some non-human animals. In humans, usually pubescent or adult males are able to start growing beards, on average at the age of 18.
Throughout the course of human history, societal attitudes toward male beards have varied widely depending on factors such as prevailing cultural traditions and the current era's fashion trends. Several religions have considered a full beard to be essential and mandate it as part of their observance. Other cultures, even while not officially mandating it, view a beard as central to a man's virility, exemplifying such virtues as virtue, beauty, wisdom, strength, fertility, sexual prowess, and high social status. In cultures where facial hair is uncommon (or currently out of fashion), beards may be associated with poor hygiene or an unconventional demeanor. In countries with colder climates, beards help protect the wearer's face from the elements. Beards also provide sun protection.