This character is a Other Symbol and is commonly used, that is, in no specific script. The character is also known as flower cards.
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+1F3B4 offers a line break opportunity at its position, except in some numeric contexts.
The CLDR project calls this character “flower playing cards” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: card, cards, flower, game, Japanese, playing.
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: 🎴︎ See the Emojipedia for more details on this character’s emoji properties.
The Wikipedia has the following information about this codepoint:
Hanafuda (Japanese: 花札, lit. 'flower cards') are a type of Japanese playing cards. They are typically smaller than Western playing cards, only 5.4 by 3.2 centimetres (2.1 by 1.3 in), but thicker and stiffer, and often with a pronounced curve. On the face of each card is a depiction of plants, tanzaku (短冊), animals, birds, or man-made objects. One single card depicts a human. The back side is usually plain, without a pattern or design of any kind, and traditionally colored either red or black. Hanafuda are used to play a variety of games including Koi-Koi and Hachi-Hachi.