rtsa gsum

1) the three nadis [lus kyi rtsa ro ma dang, rkyang ma, dbu ma gsum]; 2) the three roots [guru, yidam, dakini [+ dharmapala] producers of dharma, the root of blessing is the guru, the root of siddhi the yidam, the root of protection from obstacles the dakini] [IW]

three roots (bla ma, yi dam, mkha' 'gro) [JV]

1) the three roots, [guru, yidam, dakini [+ dharmapala]. 2) the three channels, ro ma / la la na, rkyang ma / ra sa na, dbu ma / kun 'dar ma / avadhuti] [RY]

roots, three Guru, yidam, and dharmapala. These three are objects of refuge in the Vajrayana in addition to the Three Jewels [RY]