His "Mind-Reading" ability is one among the Six Supernatural Powers of Buddhism. Officially known as the "Power of Discerning Others' Minds" or "Wisdom of Differentiation Power." It's also called "Observing the Minds Numeration Wisdom Power," "Knowledge of Others' Minds," or "Differentiation of Minds." It means to possess the wisdom to truly know the differences within other people's minds—this supernatural power.
It's equivalent to the "Wisdom of Others' Minds" within the Ten Wisdoms. In the 'Abhidharma-mahavibhasa Shastra, Volume 15 (T26, No. 432),' it is asked, "What is the power of discerning others' minds?" The answer: "The minds of other sentient beings, including the searching, pondering minds, can all be truly known; the presence of greedy thoughts can be truly known, as well as the absence of such thoughts… The non-liberated mind, the liberated mind, both can be truly known, this is called the power of discerning others' minds."
