Lama Sangdu (bla ma gsang 'dus).
A terma discovered by Guru Chowang (1212-1270), one of the earliest and most important tertons. It focuses on the guru principle as Padmasambhava's sambhogakaya form of the fivefold mandala of Totreng Tsal. Lama Sangdu means 'embodiment of the master's secrets.' [RY]