Doldurma qələm — su əsaslı mürəkkəb rezervuarı olan bir qələmdir. Doldurma qələm kimi bir şey yaratmaq üçün ilk sifariş,Misir xəlifəsi Əl-Muizz li-Din Allah, tərəfindən onuncu əsrdə təqdim edilmişdir ki, Qazi əl-Numan əl-Tamiminin Kitab əl-Məcalis vəl-musayardtda qeyd olunub.(d. 974).[1]
We wish to construct a pen which can be used for writing without having recourse to an ink-holder and whose ink will be contained inside it. A person can fill it with ink and write whatever he likes. The writer can put it in his sleeve or anywhere he wishes and it will not stain nor will any drop of ink leak out of it. The ink will flow only when there is an intention to write. We are unaware of anyone previously ever constructing (a pen such as this) and an indication of 'penetrating wisdom' to whoever contemplates it and realises its exact significance and purpose. I exclaimed, 'Is this possible?' He replied, 'It is possible if God so wills'.