From Tar Valon Library
A stylized mark, usually black, in the shape of a teardrop balanced on its point, based on the male half of the Aes Sedai symbol from the Age of Legends. Scrawled on a door or a house, it is an accusation of evil against the people inside, calling them Darkfriends. It is also thought to be able to bring bad luck.
- On the Winespring Inn after the Trolloc attack when Moiraine and Lan stay there (TEotW, Ch. 7).
- On doors in baerlon (TEotW, Ch. 13).
- On doors in Caemlyn (TEotW, Ch. 39).
- On The Queen's Blessing (attempted) (TEotW, Ch. 43).
- In Nynaeve's Accepted Test (TGS, Ch. 23).
- On doors in Emond's Field (TSR, Ch. 29).
(Reference: Book Glossary)