it's an "eastern" style emoticon https://en.wikipedia.org/wiki/List_of_emoticons#Eastern https://en.wikipedia.org/wiki/List_of_emoticons#Eastern though they're

it's an "eastern" style emoticon https://en.wikipedia.org/wiki/List_of_emoticons#Eastern https://en.wikipedia.org/wiki/List_of_emoticons#Eastern though they're more common in the west nowadays (but not enough for your virtual keyboards to have them built in...)