栴檀板 Sendan Plate or Sendan no Ita
What is Sendan no Ita of Samurai Armor?
This is one of the decorations of the great armor (O-yoroi). It is a tool to protect against attacks by arrows and to guard the gap under the right armpit. It is flexible because it is composed of a metal fitting called the ""Crown Plate"" (Kanmuri no Ita) at the top and three stages of small armor plates (Kozane Ita), so it does not interfere when drawing a bow or swinging a sword.
See more terms related to samurai armor in this samurai armor glossary