thrikarana

 According to the Matsya Purana, Brahma's left half emerged as a female, who is celebrated under the names of Sarasvati, Savitri, and Gayatri. The three represent purity in 

1. thought, 
2. word, and 
3. deed (thrikarana shuddhi). 

https://www.google.com/search?q=thrikarana