大部分都包含一个恒星类型或列有恒星相关信息的目录的简称，之后是一组标号。
Most consist of an abbreviation that stands for either the type of star or a catalog that lists information about the star, followed by a group of symbols.
聚类是通过相似度对没有类别标号的数据集中数据进行分组，使得组内对象相似度高而组间相似度低。
Clustering group the absence category labels data by similarity degree, there are high similarity inner group and low similarity between groups.
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