It wasnarrated that Wa'il bin Hujr said:
"I saw the Prophet (ﷺ)making a circle with his thumb and middle finger, and raising the onenext to it (the index finger), supplicating with it during theTashah-hud." (FR)
English reference (FR): Vol. 1, Book 5, Hadith 912 (FR)
Arabic reference (FR): Book 5, Hadith 965 (FR)