Grand Cordon of the Order of the Precious Crown
A high class of the Japanese Order of the Precious Crown, typically awarded to female members of the imperial family or distinguished women.
Her Majesty the Empress was awarded the Grand Cordon of the Order of the Precious Crown.
宝冠章 is the general Order of the Precious Crown; 宝冠大綬章 is specifically the Grand Cordon class within that order.
Compound of 宝冠 (precious crown) + 大綬 (grand cordon) + 章 (order/decoration). The name reflects the order's insignia and rank.