Ibn 'Umar reported that when the Messenger of Allah (ﷺ) sat for tashahhud he placed his left hand on his left knee. and his right hand on his right knee. and he raised his right finger, which is next to the thumb, making supplication in this way, and he stretched his left hand on his left knee. Another version on the authority of Ibn 'Umar (RA) says: When the Messenger of Allah (ﷺ) sat for tashahhud, he placed his left hand on his left knee and placed his right hand on his right knee, and he formed a ring like (fifty-three) and pointed with his finger of attestation.
Hafiz Abu Yahya Nurpuri
Explanation: ↰ The Arabs used to count with their fingers in a particular manner. In this method, at the number 53, the hand takes on a specific shape in which, except for the thumb and the index finger, the remaining three fingers are folded, and the index finger is extended while the tip of the thumb is placed at the base of the index finger. Read the complete article “Raf‘ Sababah, The Position of Modality (Maqam Kayfiyyat)”.