"Normal section" is a technical term that refers to the intersection of a plane with a three-dimensional object. Synonyms for this term may include "cross section", which has a similar meaning but is more widely used in engineering and scientific contexts. Other synonyms might include "slice", "cut", or "segment" - all of which imply a similar action of dividing an object into smaller parts for analysis or examination. In some cases, "normal section" could also be replaced with terms like "profile", "outline", or "trace" depending on the specifics of the situation. Whatever term is used, it is important to remember that precise language is always key in technical and scientific fields.