What is "hanun"

Hanun was a king of Ammon described in 2 Samuel. Upon the death of his father Nahash, Hanun ascended to the throne of the Ammonites. When King David sent ambassadors to convey his condolences, Hanun reversed his father's pro-David policy and humiliated the emissaries, stripping them of their clothes and shaving half of their beards. He allied with the Syrian king Hadadezer against Israel but was defeated and deposed. His brother Shobi was made king in his stead and became a loyal vassal of David's.