in the first millennium CE] brought them into greater prominence and distributed their cult far and wide. [...] The primitive Yogini cult was also revived on account of the increasing influenced of the cult of the Seven Mothers." Script characters Matrika (Sanskrit mātṛkā) is also a term used to denote features of Indic scripts (also in combination with aksara, matrikaksara), though there is considerable variation in the precise interpretation of the term from one author to another. Sometimes it denotes a single character, the entire collection of characters (an "alphabet"), the alphabetic "matrix" used as a collation tool, vowels in particular (considered erroneous by Georg Bühler), or the sound of the syllable represented by the character. Various traditions identify the script matrikas with the personified divine Matrikas. According to K.C. Aryan, the number of Matrikas is determined in the structure of the Devanagari alphabet. First is the (A) group which contains the vowels, then the (Ka), (Cha), (Ta), (ta), (Pa), (Ya) and (Ksha) groups. The seven mother goddesses (Saptamatrikas) correspond to the seven consonant groups; when the vocalic (A) group is added to it, the eight mother goddesses (Ashtamatrikas) are obtained. The Shaktas hold that the Mothers preside over impurities (mala) and over sounds of the language. The Mothers were identified with fourteen vowels plus the anusarva and visarga, making their number sixteen. In Tantra, the fifty or fifty-one letters including vowels as well as consonants from A to Ksha, of the Devanagari alphabet itself, the Varnamala of bija, have been described as being the Matrikas themselves. It is believed that they are infused with the power of the Divine Mother herself. The Matrikas are considered to be the subtle form of the letters (varna). These letters combined make up syllables (pada) which are combined to make sentences (vakya) and it is of these elements that mantra is composed. It is believed that the power of mantra derives from the fact that the letters of the alphabet are in fact forms of the goddess. The 50 Matrika Kalas are given in the same account as follows: Nivritti, Pratishtha, Vidya, Shanti, Indhika, Dipika, Mochika, Para, Sukshma, Sukshmamrita, Jnanamrita, Apypayani, Vyapini, Vyomarupa, Ananta, Srishti, Riddhi, Smriti, Medha, Kanti, Lakshmi, Dyuti, Sthira, Sthiti, Siddhi, Jada, Palini, Shanti, Aishvarya, Rati, Kamika, Varada, Ahladini, Pritih, Dirgha, Tikshna, Raudri, Bhaya, Nidra, Tandra, Kshudha, Krodhini, Kriya, Utkari, Mrityurupa, Pita, Shveta, Asita, Ananta. Sometimes, the Matrikas represent a