Japanese Invasion Money.

During World War II, Japan occupied many countries in Asia, including Burma (Myanmar), Philippines, Malaya (West Malaysia), Oceania, and the Netherland Indies (now Indonesia). There, the Japanese Government printed their own currency, now called "Japanese Invasion Money" or JIM.

The propaganda was that Japan was protecting these countries from Western influence, under the Greater East Asia Co-Prosperity Sphere. In reality, the Japanese occupation was marked with brutal oppression of the people in these countries.

See: Tom Chao’s Paper Money Gallery - Japanese Invasion Money | Joel Anderson’s Coins and Notes from World War II