旗印 (はたじるし) Japanese meaning | Kotomora。
Each Sengoku warlord displayed their own banner emblem.
This flag insignia was designed based on the family crest.
Usage patterns
〈事〉を旗印にするto make X one's banner/cause
That political party has made reform its banner cause.
〈事〉を旗印として掲げるto hold up X as a rallying cause
旗印の下に集まるto gather under a common banner/cause
People gathered under the banner of freedom.
旗印を掲げるto raise/display a banner emblem
The general proudly raised his own banner emblem.
They are active with peace held up as their rallying cause.