This is the 946th most frequent Chinese word.
星
"Star."
Here, '星' is part of '星星', meaning 'stars'.
天空中的星星非常明亮。
The stars in the sky are very bright.
In this context, '星' metaphorically refers to a prominent or talented person.
她是学校的新星，特别擅长音乐。
She is the new star of the school, especially skilled in music.
The character '星' forms '星期', which means 'week'.