Nun was the father of Joshua and a man of the tribe of Ephraim. When referring to Joshua, he was called "Joshua, son of Nun" to indicate his lineage.
Nun (נון) means 'fish' in Hebrew. It is a word influenced by ancient Akkadian (nūnu). Although detailed information is not provided in the Bible, it is presumed that he was a fisherman or worked in a profession related to fish.