The phrase "set at intervals" refers to the act of placing something at regular or planned intervals. Some synonyms for this phrase could include "spaced out," "arranged periodically," "positioned regularly," "distributed evenly," or "placed at intervals." Each of these phrases conveys the same idea, but with slightly different wording that can be more appropriate in certain contexts. For example, "spaced out" might be more commonly used when talking about objects placed at consistently large distances, while "distributed evenly" might be more appropriate when discussing a more complex arrangement of objects. Regardless of which phrasing is used, they all share the same idea of controlled and deliberate spacing.