The Prophet ﷺ said, "This and this are the same." He meant the little finger and the thumb.

عَنِ النَّبِيِّ ﷺ قَالَ هَذِهِ وَهَذِهِ سَوَاءٌ يَعْنِي الْخِنْصَرَ وَالإِبْهَامَ