pen·ta·gram /ˈpɛntəˌgræm/
  五芒星形
  Pen·ta·gram n.  A pentacle or a pentalpha. “Like a wizard pentagram.”
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  pentagram
       n : a star with 5 points; formed by 5 straight lines between the
           vertices of a pentagon and enclosing another pentagon
           [syn: pentacle]