Answer:
Possibly molar.
Step-by-step explanation:
It depends on the context in which it is used. If it appears as 1.52m, it likely means 1.52 Molar, or 1.52M. Molar is defined as moles/liter. It is usually capitalized, but I've increasingly seen it appearing as a small "m." The letter "n" typically means actual moles of a substance. If the letter m appears as part of an equation, it should be defined at that point, or in the previous paragraphs.