Natyashastra
आभुग्नमथ निर्भुग्नं तथा चैव प्रकम्पितम् । उद्वाहितं समं चैव उरः पञ्चविधं स्मृतम् ॥ २२४॥
The breast is said to be of five kinds: Ābhugna, Nirbhugna, Prakampita, Udvāhita, and Sama. These are the five types of the breast.
english translation
Abhugnamatha nirbhugnaM tathA caiva prakampitam । udvAhitaM samaM caiva uraH paJcavidhaM smRtam ॥ 224॥
hk transliteration by Sanscript