What does M2 stand for?

Insular Segment of Middle Cerebral Artery - Cardiology (DAVI)

Marked Dullness - on Auscultation - Medicine (DAVI)

Mitral Second Heart Sound - Cardiology (DAVI)

Money Supply of a Country, Including M₁ and Commercial Time Deposits - Economics

Masterspec 2 - Production Systems for Architects & Engineers, Inc. - Information service or system (IID)

Moluccan Cockatoo - Bird

Square Meter