There are multiple definitions:

1. popliteofibular ligament(English)

   • an important stabilizer of the knee found within the posterolateral corner (PLC) of the joint. Injuries to the PLC can cause substantial patient morbidity. Accurate PFL visualization has been historically challenging, impeding injury diagnosis and treatment. The gold standard for in vivo PFL visualization is magnetic resonance imaging (MRI), but this procedure has slice thickness limitations, is costly, and is subject to longer wait times. Ultrasonographic PFL assessment is a potentially viable alternative
   • POL, MRI, PLC
   • Musculoskeletal system, Ultrasound
   • https://doi.org…256-021-03813-9

2. palpebral fissure length(English)

   • measured with a calliper ruler
   • CTT
   • Ophthalmology, Veterinary medicine
   • https://doi.org…24.2012.01069.x

3. phonemic verbal fluency(English)

   • AD, ADAS, aMCI, BADL, IADL, MCI, MMSE, WML
   • Speaking / language disorders, Logopedics and phonetics, Gerontology/Geriatrics, Psychiatry, Alzheimer's disease, Aging, Dementia
   • https://doi.org/10.1002/gps.1816

4. pyruvate formate-lyase(English)

   • PDH
   • Microbiome, Metabolism, Infection
   • https://doi.org…8/mBio.01989-20