The Essence
Al-Aliyy is the Exalted, the One who is absolutely elevated above any imperfections, limitations, or partners. His status, power, and essence are infinitely higher than anything in creation.
In the Quran
وَهُوَ الْعَلِيُّ الْعَظِيمُ
"And He is the Most High (Al-Aliyy), the Most Great. (Surah Al-Baqarah 2:255)"
In Your Duas
سُبْحَانَ رَبِّيَ الأَعْلَى
"Glory is to my Lord, the Most High."
— Sahih Muslim 772 (Said during Sujud)