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+1F646 prohibits a line break after it, if itβs followed by an emoji modifier.
The CLDR project calls this character βperson gesturing OKβ for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: exercise, gesture, gesturing, hand, OK, omg, person.
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 The character can be changed in appearance, if it is followed by an emoji modifier. See the Emojipedia for more details on this characterβs emoji properties.
On Youtube this character is sometimes wrongly displayed as U0001f646.
The Wikipedia has the following information about this codepoint:
The OK gesture or OK sign or ring gesture (symbol/emoji: "π") is performed by joining the thumb and index finger in a circle, and holding the other fingers straight or relaxed away from the palm. Commonly used by scuba divers, it signifies "I am OK" or "Are you OK?" when underwater. In most English-speaking countries it denotes approval, agreement, and that all is well or "okay". In other contexts or cultures, similar gestures may have different meanings including those that are negative, offensive, financial, numerical, devotional, political, or purely linguistic.