This is in reference to what they used to do when sitting for tashahud and before offering salam. They used to raise their palms.

I Understand That Rafa Yadain Is Part Of The Sunnah As It Is Mentioned In Many Authentic Hadiths, But What Does This Hadith Imply: Jaabir (radhiyallahu unhu) said: Rasulullah (Sallallahu alayhi wa Sallam) came out (from his house) towards us and said: ‘Why do I see you raising your hands as if (your hands) are the tails of mischievous horses. Be tranquil in Salaat.’” (Muslim) – It Is Used By The Hanafis To Say That The Prophet (SAW) Did Not Raise His Hands In The Four Prescribed Places.