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+1F633 offers a line break opportunity at its position, except in some numeric contexts.
The CLDR project calls this character βflushed faceβ for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: amazed, awkward, crazy, dazed, dead, disbelief, embarrassed, face, flushed, geez, heat, hot, impressed, jeez, what, wow.
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: π³οΈ See the Emojipedia for more details on this characterβs emoji properties.
On Youtube this character is sometimes wrongly displayed as U0001f633.
The Wikipedia has the following information about this codepoint:
Flushing is to become markedly red in the face and often other areas of the skin, from various physiological conditions. Flushing is generally distinguished from blushing, since blushing is psychosomatic, milder, generally restricted to the face, cheeks or ears, and generally assumed to reflect emotional stress, such as embarrassment, anger, or romantic stimulation. Flushing is also a cardinal symptom of carcinoid syndromeβthe syndrome that results from hormones (often serotonin or histamine) being secreted into systemic circulation.