noun
white diamond shape; white diamond signal shape (marine safety)
Rare technical term for a white diamond-shaped object or signal, especially in marine safety contexts.
海上安全の文脈で「白色ひし形形象物」という用語が使われることがある。
The term 'white diamond shape' is sometimes used in marine safety contexts.
Compound of 白色 (white) + ひし形/菱形 (diamond shape) + 形象物 (figure/object). The exact origin is uncertain; it appears to be a technical descriptive term.