kshetrajna | क्षेत्रज्ञ
Prahlad has described 12 qualities of jiva. One of them is kshetragya (Devanagari: क्षेत्रज्ञ ISO15919: kṣetrajña).
kshetra = body. gya = knower.
One who knows the body is kshetragya.
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