Invariants are objects or values that remain unchanged despite transformations or variations of a system or function. There are several synonyms for this term including constants, fixed points, unvarying elements, immutable properties, and static factors. Constants refer to values that remain the same throughout a process or formula, while fixed points describe points that do not move even after a change is applied. Unvarying elements pertain to the components of a system that remain stable, while immutable properties are characteristics that remain unchanged despite different conditions. Finally, static factors encompass features that remain consistent regardless of external factors. These words can be used interchangeably depending on the context in which they are used.