The word literally means “O God”. The vocative يا known as حرف النداء has been omitted to highlight than nothing comes before God. The letter م is attached to the end of the word to indicate the presence of on omitted letter at the beginning of the word.

The word اللهم is typically translated as “O God” or “O Allah” but it’s actually an expression whereby you’re invoking Allah by all of His names and attributes that are known and unknown to you.

God has 99 formal names that are known to us but His essence is beyond our comprehension. Thus, as His servants, we call upon Him by His known names and also by the attributes that have been veiled from us.

Answered by: Shaykh Azhar Nasser