Blessed Habits in the Writing of Fatwas: Seventeen Points
Answer
1. When the post was brought to Hazrat Wala ﵋, he would first glance over it and see which was an istifta’ and which a personal letter; he set each aside separately, and marked the istifta’ with the letter fe; and after writing the answer he put a mim beneath the fe — the fe pointing to fatawa, the mim to Mahmud.
Source: Fatawa Mahmudiyya
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