A 
hatpin is a decorative pin  for holding a hat  to the head, usually by the hair.  In Western culture , a 
hatpin is almost solely a female
Kaynak: HatpinCentrostephanus longispinus, the 
hatpin urchin, is a species  of sea urchin  in the family Diadematidae .  There are two sub-species,
Kaynak: Centrostephanus longispinusIt was also worn by women as well, often with 
hatpin s to keep it in place.  Nowadays they are rarely seen except at sailing or rowing
Kaynak: BoaterThere is some debate that Miller's 
hatpin stabbed Cahill in the leg. The riding down and batoning of peaceful people, many of them being
Kaynak: 1912 Brisbane general strikeThe Sunningdale Mystery: Doris has bobbed short hair, no need for 
hatpin.  Hollobys embezzled, and the killer is male, framing woman with 
hatpin.
Kaynak: Agatha Christie's Partners in Crime"
hatpin" electrodes including recording from single neurons for over 30 days, and consistent recordings for greater than three years from
Kaynak: Brain implantBrisbane General Strike During the 1912 Brisbane General Strike  for the right to organise trade unions, Miller thrust her 
hatpin into the
Kaynak: Emma MillerThe next day, when Miss Marple goes to see her, she finds Cora dead, stabbed in the back with a 
hatpin.  Cora's companion of many years,
Kaynak: Murder at the Gallop