There are multiple definitions:

1. personal protective equipment(English)

   • MCI, MSDS, OSHA, WMD, BUA
   • Safety and health

2. pitch period entropy(English)

   • PD, RPDE
   • Entropy

3. Pressure Poisson Equation(English)

4. pre-participation evaluation(English)

   • recommended to prevent sudden cardiac death in athletes
   • Sports medicine, Preventive medicine
   • https://doi.org…047487320932018

5. pooled prevalence estimate(English)

   • Statistics
   • https://doi.org/10.1002/ca.22429

6. palmar-plantar erythrodysesthesia(English)

   • EOC, OS, PFS, PLD
   • Ovary and uterus, Oncology
   • https://doi.org….2013.14.3.2131