Professional Science Master's, a postgraduate academic degree program established by the Council of Graduate Schools
The Protocols of the Elders of Zion, acronym for Protokoly sionskix mudrecov or The Protocols of the Elders of Zion, a tract alleging a Judeo-Masonic plot for world domination
Science
Paraspinal Musculature, the muscles adjacent to the vertebral column
Peptide spectrum match, a (possible) identified peptide in a protein mass spectrometry identification experiment
Phase-shift keying, or Phase Shift Modulation, a digital modulation scheme
Phase-shift mask, photomasks that take advantage of interference to improve image resolution in photolithography
Phenomenal Self model, in consciousness what comprises experiences of ownership, of first person perspective, and of a long-term unity of beliefs and attitudes
Plant (or Potato) Starch Material, generic label for compostable plant-based materials used as alternatives to plastics for items such as disposable cutlery, broader meaning than Plastarch
Platoon Sergeant Major, a short-lived rank in the British Army of Warrant Officer Class III
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