I saw the Prophet (peace be upon him placing his right hand on his right thigh and raising his forefinger curving it a little. (Using translation from Abū Dāʾūd 991)
أَنَّهُ رَأَى رَسُولَ اللهِ ﷺ قَاعِدًا فِي الصَّلَاةِ وَاضِعًا ذِرَاعَهُ الْيُمْنَى عَلَى فَخِذِهِ الْيُمْنَى رَافِعًا إِصْبَعَهُ السَّبَابَةَ قَدْ أَحْنَاهَا شَيْئًا وَهُوَ يَدْعُو