al-Raheem refers to mercy that is specifically for the believers.

اشاره به رحمت خداوند برای مومنان خاص دارد.

Ar-Rahim in the Quran (Chapter 33)

هُوَ ٱلَّذِى يُصَلِّى عَلَيْكُمْ وَمَلَٰٓئِكَتُهُۥ لِيُخْرِجَكُم مِّنَ ٱلظُّلُمَٰتِ إِلَى ٱلنُّورِ ۚ وَكَانَ بِٱلْمُؤْمِنِينَ رَحِيمًا ﴿٤٣﴾

He it is Who sends His blessings on you, and (so do) His angels, that He may bring you forth out of utter darkness into the light; and He is Merciful to the believers.