Concept of nad and bind

NAD AND BIND
Indian philosophy gives a significant position to the sound.  Saivism,  one  of  the  prominent  branches  of  Indian religious  philosophy,  put  forward  the  key  phonematic representations as Nada and Bindu. Saivite doctrines of monism and  dualism  differs  each  other  with  regard  to  the  nature  and function  of  sound.  Here  is  an  attempt  to  analyze  the  earliest dualistic  Saiva  text-  Tirumantiram  in  connection  with  the discussion of the aforementioned vital sound principles.

According  to  him  Nada  is  an  unstruck  (anahata),  almost unmanifest,  sound  (dhvani)  for  there  the  phonemes  are  not differentiated. Sometimes it is referred to by the term phoneme
(varna), as Abhinavagupta says:

eko nadatmako varnah sarvavarnavibhagavan

so’nastamitarupatvadanahata ihoditah

 Nada is also considered to be as cit, the level of Sadasiva: the ontic level, where the phonematic emanation is projected into the energy  and  where  consonants  begin  to  arise.

“From  Sakti,  in effect, the sound energy becomes first Nadanta, then Nada, then Nirodhini, next comes Bindu, itself preceeding ardhacandra Bindu  is  one  of  the  most  significant  terms  in  the  speculations about the word and energy.
Later it forms the basis of the nath jogis for the self enlightenment and kundlini jagran