The Life & Character of the Seal of Prophets (sa) - Volume I — Page xiv
xiv the Holy Prophet sa and Companions of the Promised Messiah as. RH: An abbreviation for Raḥimahullāh , meaning, “May Allāh have mercy upon him,” is written after the names of deceased pious Muslims who are not Companions. In transliterating Arabic terms we have followed the following system adopted by the Royal Asiatic Society: ا at the beginning of a word, pronounced as a , i , u , preceded by a very slight aspiration, like h in the English word ‘honour. ’ ث th , pronounced like th in the English word ‘thing. ’ ح ḥ , a guttural aspirate, stronger than h. خ kh , pronounced like the Scotch ch in ‘loch. ’ ذ dh , pronounced like the English th in ‘that. ’ ص ṣ , strongly articulated s. ض ḍ , similar to the English th in ‘this. ’ ط ṭ , strongly articulated palatal t. ظ ẓ , strongly articulated z. ع ‘ , a strong gutteral, the pronunciation of which must be learnt by the ear. غ gh , a sound approached very nearly in the r ‘grasseye’ in French, and in the German r. It requires the muscles of the throat to be in the gargling position whilst pronouncing it. ق q , a deep guttural k sound. ء ’ , a sort of catch in the voice.