Nihoner

“Upper part of a flag” in Japanese

Short answer
旗頭 hatagashira はたがしら

Upper part of a flag in Japanese is “旗頭” (hatagashira). Full meaning: leader, boss; upper part of a flag; (Okinawa) bamboo poles with an attached vertical flag and an elaborate display at the top that are used during the annual fertility and thanks-giving festivals.

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