triangular headpiece
A type of headband sometimes worn by ghosts in Japanese folklore.
Derived from Edo period burial rituals, it was originally intended to protect the newly deceased from evil spirits. It has various regional names—hitai-eboshi (額烏帽子, lit. "forehead headpiece"), tenkan (天冠), houkan ("diadem", only Buddhists use this word), kami-kaburi, kami-kakushi (髪隠し, lit. "hair-hider"), zukin (頭巾, lit. "hood" and also used as a generic term), and so on.
