Al-Batin
The Hidden One
ٱلْبَاطِنُ
Explanation
The one who is hidden and concealed from the senses. His essence cannot be fully comprehended by His creation.
In the Quran
هُوَ ٱلۡأَوَّلُ وَٱلۡأٓخِرُ وَٱلظَّـٰهِرُ وَٱلۡبَاطِنُۖ وَهُوَ بِكُلِّ شَيۡءٍ عَلِيمٌ
"He is the First and the Last, the Ascendant and the Intimate, and He is, of all things, Knowing"