If you install iPadOS 26, the reed pen is added automatically, but you might not immediately see it if you open the drawing ...

The odd-looking pen, which writes on an angle, turns handwriting into a work of art. Written by Ian Phillips and produced by Alana Yzola, footage by Shinah Chang from Crooked Calligraphy.

An Arabic reed pen, or qalam, is a traditional writing tool used in Islamic calligraphy, known for its ability to create elegant, flowing strokes with varying thickness.