red star

noun Astronomy.
any star with a low surface temperature and a reddish color, as a red giant or a red dwarf.

Origin:
1900–05

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Shortly afterward, the red star that the communists had placed on the spire of
  the building was removed.
One more thing that caught my eye is a bright red star on the bottom right
  corner in the picture.
Red star shows approximate location of seismic event.
Notice there is not a red star next to the date of birth field.
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