The 2 symbols seen on pirate flags & bottles of poison
[DOC] [TLE] Pirates, Poison, and Professors: A Look at the Skull and Crossbones ... [PAR] Sep 19, 2016 ... Pirates, Poison, and Professors: A Look at the Skull and Crossbones Symbol ... of 
the symbol, now tarnished by its piratical associations.2 Not all pirates used the 
skull and crossbones; other flags featured hourglasses, ...