Word

Satya-Jnana-Ananta Vidya

Sanskrit

सत्यम् ज्नञम् अनन्तम् विद

IAST

satyam jnañam anantam vidyā

In General

Upanishad uses the word vidya as a technique to do spiritual Sadana. It is meditation and also all other faculties like memorizing, wishing, understanding, aspiring, contemplating and physical activities like developing personality. The technique help the Sadhaka to finally evolve into a supra physical spiritual life

Veda

This Vidya occurs in the Taittiryopanishad Brahmananda valli first mantra

Brahman is sathyam janam anandam i.e. Truth Knowledge Infinity

This is the Svarupa-Lakshana or the essential nature of Brahman. Infinity is Bliss, Brahman is Consciousness-Bliss. In Chandogya Upanishad and Brihadaranyaka Upanishad, one can find the same idea regarding the nature of Brahman. Truth-Knowledge-Infinity means Existence-Knowledge-Bliss or Satchidananda.