also: ばんこっき
noun
flags of all nations; international flags
Refers to a collection of national flags, often displayed together at events like sports meets, international conferences, or celebrations.
運動会の会場には万国旗が飾られていた。
The sports day venue was decorated with flags of all nations.
国際会議のホールに万国旗が
Flags of all nations are lined up in the international conference hall.
国旗 means a single national flag, while 万国旗 refers to a collection of many different national flags.
Compound of 万国 (ばんこく, 'all nations') and 旗 (き, 'flag'). The reading ばんこっき arises from a common colloquial gemination of く to っ.