There are multiple definitions:

1. probabilistic neural network(English)

   • Neural network, Statistics

2. perineuronal net(English)

   • a specialized type of extracellular matrix found in the central nervous system
   • chABC, CNS, DCN
   • Neurons, Electrophysiology, Adaptation & plasticity, Brain (dys)function
   • https://doi.org…nlm.2020.107358