There are multiple definitions:

1. posterior communicating artery(English)

   • AChA, AMZ, BA, OTT, PCA, PCP, PMS, SCA, TcA, STZ, UnR
   • Anatomy, Vessel properties
   • https://doi.org…018.1.JNS173139

2. principal coordinate analysis(English)

   • refers e.g. to plots of weighted and unweighted UniFrac distance based on 16S rRNA gene sequencing
   • ANT, AROMA, FD, ICA, INU, XG, BMDM, CA, FLICA, GF, HDAC, IL-1, IVIG, KD, LCWE, OTU, PCA, SCFA, SPF, TJ, WT, NMDS, T1DM
   • Medical imaging, Signal analysis, Microbiome, Vascular disease, Dentistry
   • https://doi.org…sci.2023.108478
   • https://doi.org…SAHA.124.325079
   • https://doi.org…598-025-01534-w
   • https://doi.org…ent.2025.106109