There are multiple definitions:

1. parathyroid hormone-like protein(English)

   • Thyroid and parathyroid

2. proteolipid protein(English)

3. pyridoxal phosphate(English)

4. Poisson line process(English)

   • PPP
   • Communication, Data exchange
   • https://doi.org…OC.2021.3061778

5. Peguero–Lo Presti(English)

   • refers to a novel ECG voltage criterion, suggesting that it has greater sensitivity than traditional ECG-LVH criteria
   • ECG, LVH
   • Cardiology, Electrophysiology, Pathology
   • https://doi.org…093/ajh/hpad117

6. perceptual linear prediction(English)

   • ILPR, LP, LPCC
   • Signal analysis
   • https://doi.org…OC.2021.3126493