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+1F61E offers a line break opportunity at its position, except in some numeric contexts.
The CLDR project calls this character βdisappointed faceβ for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: awful, blame, dejected, disappointed, face, fail, losing, sad, unhappy.
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 U0001f61e.
The Wikipedia has the following information about this codepoint:
Disappointment is the feeling of dissatisfaction that follows the failure of expectations or hopes to manifest. Similar to regret, it differs in that a person who feels regret focuses primarily on the personal choices that contributed to a poor outcome, while a person feeling disappointment focuses on the outcome itself. It is a source of psychological stress. The study of disappointmentβits causes, impact, and the degree to which individual decisions are motivated by a desire to avoid itβis a focus in the field of decision analysis, as disappointment is, along with regret, one of two primary emotions involved in decision-making.