Japanese Military Yen was a currency used by the military government of Japan during the Second World War. As with any commonly used term, there are synonyms that can be used to refer to the Japanese Military Yen. One such synonym is "sen," which is the Japanese word for "coin." Another synonym is "gun currency," which is derived from the Japanese word for military, "gun." Other synonyms for Japanese Military Yen include "war yen" and "Japanese occupation currency." While these synonyms may not be as commonly used as the term "Japanese Military Yen," they are still relevant and may be useful for those interested in studying the history of Japanese currency during the Second World War.