查WIPO时发现WO: 919214 wo在这里代表什么呀

WO: 919214
    22.05.2007 - Date of receipt of the subsequent designation by the Office of the Contracting Party of the holder
    01.06.2007 - Date of receipt by the International Bureau
    Status: Abandoned

请问919214前面的 wo在这里代表什么呀

哦，谢谢，知道了