Shepherds of old carried a rod and a staff, two important tools of their trade. For the shepherd, a rod was a stick or club that could be used offensively or defensively against a threat to himself or his flock. It was also used for discipline and counting, especially to determine the tithe of the increase of a flock (Leviticus Full text here - https://www.tomorrowsworld.org/commentary/rod-and-staff-tools-of-the-shepherd