The story
A macronless form of Iōshima, an alternate—and technically incorrect—pronunciation of the same Japanese name as Iwo Jima.
Etymology from Wiktionary, CC BY-SA 4.0.
Ioshima
Today it means: Synonym of Iwo Jima, one of the Volcano Islands administered by Japan as part of Tokyo's Ogasawara Subprefecture. Full definition →