Nadi is the last koot and the most important Koota in Horoscope matching or Kundli milan. Nadi means pulse. The pulse is indicative of heart beat or nervous energy. As per Ayurveda Sastra Nadi indicates the three humours Vaatha Nadi, Pitha Nadi and Sleshma Nadi.
Vaatha Nadi reveals mind or gas (causing gastric problems) Pitha Nadi indicates bile (excessive secretion of bile) Sleshma Nadi indicates phlegm (cold and phlegm formation in the chest).