* It's a typo: Perhaps you meant a similar abbreviation like MRes (Master of Research), MA (Master of Arts), or another related degree.
* It's a very specialized or institution-specific abbreviation: Some universities might use non-standard abbreviations for their programs. If you encountered this abbreviation somewhere, providing the context (e.g., the university or institution) would help clarify its meaning.
* It's not a real degree: The abbreviation may simply be incorrect or made up.
If you can provide more context about where you saw "MRel," I might be able to give you a more accurate answer.