rod

A straight, round stick, shaft, bar, cane, or staff.

A longitudinal pole used for forming part of a framework such as an awning or tent.

A long slender usually tapering pole used for angling; fishing rod.

A stick, pole, or bundle of switches or twigs (such as a birch), used for personal defense or to administer corporal punishment by whipping.

An implement resembling and/or supplanting a rod (particularly a cane) that is used for corporal punishment, and metonymically called the rod, regardless of its actual shape and composition.

A stick used to measure distance, by using its established length or task-specific temporary marks along its length, or by dint of specific graduated marks.

A unit of length equal to 1 pole, a perch, ¹⁄₄ chain, 5+¹⁄₂ yards, 16+¹⁄₂ feet, or exactly 5.0292 meters (these being all equivalent).

An implement held vertically and viewed through an optical surveying instrument such as a transit, used to measure distance in land surveying and construction layout; an engineer's rod, surveyor's rod, surveying rod, leveling rod, ranging rod. The modern (US) engineer's or surveyor's rod commonly is eight or ten feet long and often designed to extend higher. In former times a surveyor's rod often was a single wooden pole or composed of multiple sectioned and socketed pieces, and besides serving as a sighting target was used to measure distance on the ground horizontally, hence for convenience was of one rod or pole in length, that is, 5+¹⁄₂ yards.

A unit of area equal to a square rod, 30+¹⁄₄ square yards or ¹⁄₁₆₀ acre.

A straight bar that unites moving parts of a machine, for holding parts together as a connecting rod or for transferring power as a driveshaft.