https://en.wikipedia.org/wiki/Nun_(letter)?wprov=sfti1: “Nun is believed to descend from an Egyptian hieroglyph of a snake (the Hebrew word for snake, nachash begins with Nun) or eel.”

נון fish (primitive verb = H5125)

Joshua son of נון (H5126)

Earliest glyph may have been a ‣ .

The absentee father figure for military commander was once a snake (A trickster in many myths)