Meaning

1.  The letter “Sa” indicates “Ais’yaryam” prosperity, the divine powers; and 
2. “Kti”, denotes strength; 

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and in as much as She is the bestower of the above two, the Mûlâ Prakriti is named “S’akti”.

https://www.sacred-texts.com/hin/db/bk09ch02.htm