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+1F614 offers a line break opportunity at its position, except in some numeric contexts.
The CLDR project calls this character βpensive faceβ for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: awful, bored, dejected, died, disappointed, face, losing, lost, pensive, sad, sucks.
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: ποΈ See the Emojipedia for more details on this characterβs emoji properties.
On Youtube this character is sometimes wrongly displayed as U0001f614.
The Wikipedia has the following information about this codepoint:
Sadness is an emotional pain associated with, or characterized by, feelings of disadvantage, loss, despair, grief, helplessness, disappointment and sorrow. An individual experiencing sadness may become quiet or lethargic, and withdraw themselves from others. An example of severe sadness is depression, a mood which can be brought on by major depressive disorder or persistent depressive disorder. Crying can be an indication of sadness.
Sadness is one of the six basic emotions described by Paul Ekman, along with happiness, anger, surprise, fear, and disgust.:β271β4β