ذقن
 
Appears 3 times in the Quran.
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17:107 قُلْ ءَامِنُوا۟ بِهِۦٓ أَوْ لَا تُؤْمِنُوٓا۟ إِنَّ ٱلَّذِينَ أُوتُوا۟ ٱلْعِلْمَ مِن قَبْلِهِۦٓ إِذَا يُتْلَىٰ عَلَيْهِمْ يَخِرُّونَ لِلْأَذْقَانِ سُجَّدًاSay: Believe in it or believe not; surely those who are given the knowledge before it fall down on their faces, making obeisance when it is recited to them. 
 
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And they fall down on their faces weeping, and it adds to their humility. 
 
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Surely We have placed chains on their necks, and these reach up to their chins, so they have their heads raised aloft.