The stomach is considered one of the Upāngas, or minor limbs.
The movements are used primarily to communicate meaning in the context of gesture.
Please refer to the Shloka below for pronunciation. Please note that the separate movements of the head when put together in a Shloka form 'Sandhis', or compound words in the Sanskrit language. Words like 'ca', 'thatha', mean "and", "also". The separate words for each movement are also given below the shloka.
Ksāmam khalvam ca pūrnam ca samproktamudaram tridhā
Tanu ksāmam natam khalvam pūrnamādmātamucyate