There are Five Great Elements, Pancha Maha Bhootas, FIve Subtle Essences, Pancha Tan Matras. Pancha Kosas, FIve Concentric Sheaths, Pancha Pranas, Five Life Energies, Five Revolving Heavens ( Of the Planets Nine, ( two are math points, Rahu and Ketu , and two are luminaries, Sun & Moon ), five organs of perception. Pancha Jnyanendriyas, five organs of action, Pancha Karamendriyas et al. Hence FIve is the most important Number in the Pyhagoream System !