scarlet letter

noun2

1. •
   (figurative) A highly visible stigma.

   • The scarlet letters that current discourse has slapped upon people deemed “problematic,” deemed “unreachable” for feminism, have created consternation […] — 2018
2. •
   (historical) The letter "A" in scarlet cloth required to be worn by those convicted of adultery in 17th-century Puritan New England.