IIRC (If I Recall Correctly) is a commonly used acronym that is often used in informal conversations. However, there are various synonyms to this acronym that can be used to convey the same message in a more formal manner. These include "If my memory serves me correctly," "If memory serves," "If I remember correctly," and "If I am not mistaken." These synonyms are commonly used in academic, professional, and formal settings, where the use of informal language is discouraged. Regardless of the synonym used, they all mean the same thing: to convey uncertainty while providing information or recollection of a memory.