Stigma

1. noun

   the apical end of the style where deposited pollen enters the pistil

2. noun

   an external tracheal aperture in a terrestrial arthropod

3. noun

   a skin lesion that is a diagnostic sign of some disease

4. noun

   a symbol of disgrace or infamy; --Genesis

   “And the Lord set a mark upon Cain”

   Similar: mark, brand, stain