Dfds abbr. det forend dampskibssclskab <丹麥>聯合輪船公司; Det Forenede Dampskibs-Selskab(Danish—United Steamship Company)—famous for its ferries (丹麥語)聯合輪船公司; data flow description 數據流程描述; digital frequency divider scan 數字分頻掃描電路