noun
crown plate
Technical term used in armor, building, shipbuilding, and similar fields for a plate that forms or covers the top or crown of a structure.
甲冑の冠板は頭頂部を保護する重要な部品だ。
The crown plate of armor is an important part that protects the top of the head.
この橋梁の冠板は鋼鉄でできている。
The crown plate of this bridge is made of steel.