A rod is a bar or a stick, like the curtain rods in your windows or the steel rods inside the structure of a building that help make it sturdy. A rod can be a staff, like a walking stick, or a metal bar used in construction projects.

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During the original construction of a lot of homes, small metal rods, called tie rods, are inserted into the concrete form in order to hold the inner and outer forms together, and provide the structure with which the concrete can be poured. They are placed around 18 inches apart from one another, sometimes in two rows.