PSSM may refer to: Parallel-Split Shadow Map Position-Specific Scoring Matrix Pretty Soldier Sailor Moon, the official English translation of the series, often shortened as Sailor Moon Principles and Standards for School Mathematics, a policy book on mathematics education Polysaccharide storage myopathy, aka equine polysaccharide storage myopathy (PSSM or EPSM), a disease in horses Positive sleep state misperception, subjective hypersomnia without objective findings. Rhizobium leguminosarum exopolysaccharide glucosyl ketal-pyruvate-transferase, an enzyme