Ekaksharakoshah and Bijavarnabhidhanam

Each and every alphabet of sanskrit has got some meaning & some davtas associated with it. If you add a anuswar with the vowel then these become bija mantras..

Details are given here:

https://docs.google.com/viewer?a=v&pid=forums&srcid=MDg5MTQ3ODMyMTEwOTYwOTY0NTQBMTE0ODg5NjgwODgzNzI2NzE3NTQBNmd2ZFNwOGxEQUFKATAuMQEBdjI

https://www.scribd.com/document/119646440/Ekakshara-Kosha-of-Purushottamadeva