What is "sisera"

Sisera ( Hebrew: סִיסְרָא Sîsərā) was commander of the Canaanite army of King Jabin of Hazor, who is mentioned in of the Hebrew Bible. After being defeated by the forces of the Israelite tribes of Zebulun and Naphtali under the command of Barak and Deborah, Sisera was killed by Jael, who hammered a tent peg into his temple.