Who hangs a black star on their door at Christmas, and what does it mean?

BE writes: “On our cul-de-cac is a young man and woman who moved in approximately 2 years ago. Both this Christmas and last Christmas they do not decorate the exterior of their home with Christmas lights or decorations of any sort, but they do put a black 5-pointed star on their front door. They don’t leave the star on their door all year round – just over the Christmas season.  I don’t recall when they removed it from their door last year. I suspect that this black star has some occultic symbolism but am not sure what.

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