Rang-rig-chos-sku

rang-rig-chos-sku is Tibetan (Wylie transliteration). Broken down:

• rang rig (རང་རིག་) – “self-knowing,” “self-cognizing,” or “reflexive awareness”
• chos sku (ཆོས་སྐུ་) – “Dharmakāya,” “Dharma Body,” the ultimate dimension/body of a Buddha

So a concise translation is:

“Self-cognizing Dharmakāya”

or

“Self-knowing Dharma Body.”

In Dzogchen/mahayoga contexts it refers to the Dharmakāya as rang rig—awareness that knows itself nondually.