An indirect reference can be referred to with a host of synonymous terms, each offering slightly different connotations and nuances of meaning. For instance, the expression "allusion" can be used to denote this literary device, referencing to something else in a clever and subtle way. A "hint" or "implication" might suggest an indirect reference that is subtle or covert, while "innuendo" or "insinuation" might indicate something that is even more veiled or ambiguous. "Inference" or "suggestion" imply that the reader or listener must deduce the meaning of the reference for themselves, while "metaphor" or "simile" even create an indirect reference by comparing something to another thing through figurative language.