Maa Siddhidatri would be the ninth avatar of maa Durga and is worshipped over the 9th day of navratri. Ma Siddhidatri is represented with 4 arms sitting on an attractive lotus flower. Surahpadman and Tarakasura, two demons at some time, experienced obtained a blessing that they may not be destroyed. https://mattr407tsr2.iyublog.com/30429944/what-does-durga-mean