Naib is a Zensunni and later Fremen term which is used to denote the leader of a Sietch. A Naib is typically male. In the language of the Fremen, Naib means, "one who has sworn never to be taken alive by the enemy". To become a Naib, one usually has to fight and kill the previous Naib.
Behind the ScenesEdit
"Naib" is an Arabic word, نائب, meaning deputy. The word is used today for members of parliament in Arab countries. 
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