Since cross section of a Japanese quince looks like a nest of a bird – a symbol of prosperity of descendants, it was a popular choice for family crest designs.
 

Why is the family crest of the Oda family a Japanese quince?

• Oda Nobunaga’s ancestors received a family crest with a design of cross section of Japanese quince as a gift from the Asakura clan, which is why both clans have similar family crests.
• 
  The Oda family crest originated from the Asakura family crest, however, the Oda family crest has 5 petals on its flower, which is not the case in the Asakura family crest design.

 

Castle's name that stamp this family crest

・Gifu castle（Gifu）
・Inuyama castle（Aichi）
・Kiyosu castle（Aichi）
・Komakiyama castle（Aichi）
・Okusa castle（Aichi）
・Azuchi castle（Shiga）
 

Oda Nobunaga