as·ter·ism /ˈæstəˌrɪzəm/
 星群,三星符號


 As·ter·ism n.
 1. Astron. (a) A constellation. [Obs.] (b) A small cluster of stars.
 2. Printing (a) An asterisk, or mark of reference. [R.] (b) Three asterisks placed in this manner, ⁂, to direct attention to a particular passage.
 3. Crystallog. An optical property of some crystals which exhibit a star-shaped by reflected light, as star sapphire, or by transmitted light, as some mica.

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 asterism
      n 1: (mineralogy) a six-rayed star-shaped figure seen in some
           crystal structures under reflected or transmitted light
      2: (astronomy) a cluster of stars (or a small constellation)