It is said that "Yotsuwari-bishi" (simplified Takeda's family crest), whose pattern is a combination of four diamond shapes, was created during the Sengoku period because it was troublesome to draw "Hanabishi" on many battle flags.
戦国時代軍旗に「花菱」を多数描くのが煩雑なため、菱形を4つ合わせた「四つ割菱」という略紋が生まれたという。