noun
five-sided fort; pentagonal fortification
Historical military term for a star-shaped fort with five bastions. Most famously refers to Goryōkaku in Hakodate.
五稜堡は、星形の要塞として設計された。
The five-sided fort was designed as a star-shaped fortress.
noun
the Pentagon (US military headquarters)
Used as a translation or nickname for the Pentagon building in the United States, based on its pentagonal shape.
アメリカ国防総省は、五稜堡とも呼ばれる。
The US Department of Defense is also called the Pentagon.