| PPM | permanent pacemaker; phosphopentomutase; physician practice management; pigmented pupillary membrane... |
|---|---|
| PT | pain threshold; parathormone; parathyroid; paroxysmal tachycardia; part time; patient; pericardial t... |
| P&T | permanent and total [disability]; pharmacy and therapeutics |
| PTD | percutaneous transluminal dilatation; permanent total disability; personality trait disorder; preter... |
| PVL | perivalvular leakage; permanent vision loss |
| permanent magnet |
Magnetism is retained after magnetized by electrical current. So is a residual magnetism, but very strong residue. A permanent magnet does not generate heat, but the magnetism reduces by surrounding heat. A permanent magnet eventually will be de-magnetized by operation over time.
출처: www.magnetechcorp.com/Terminology.htm
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