From the Sengoku Period (Period of Warring States) through the Edo period, Japanese military commanders attached this type of symbols to their camp flags or they placed the symbols around themselves in order that they could show their positions and/or their majesties.
戦国時代(日本)から江戸時代において戦国武将達が己の位置・武威などを誇示する為に備の旗や自身の周りに置く印。