Chemistry class unit: Abbr.

MOL

Think of Avogadro’s favorite counting group, often used to measure substances in reactions.

This clue is asking for a common abbreviation used in chemistry classes to represent a standard unit of measurement. "MOL" stands for "mole," which measures the amount of a substance in chemistry (like atoms or molecules). The "Abbr." in the clue signals that the answer is a shortened form rather than the full word. It’s a straightforward abbreviation puzzle with no wordplay—just chemistry basics.