What is half star emoji?

The half star emoji is a five-pointed star with a half-filled color. The color of the star depends on the platform you are using, but most commonly it is yellow. This emoji is often used to represent a rating of 0.5 or a halfway rating between two options. It can also indicate mediocrity or a neutral stance on a certain topic. On some platforms, it is displayed as an outline of a star with a half-filled color, while on others it is shown as a solid star. The half star emoji was added to Unicode 12.0 in 2019.