There are multiple definitions:

1. Ambulatory Patient Group(English)

   • classification for surgical procedure
   • APC
   • Classification, Surgery

2. atrial appendage(English)

   • AF
   • Cardiology, Electrophysiology
   • https://doi.org….1002/jcu.23555
   • https://doi.org…1111/echo.15772

3. anterior-posterior-glide(English)

   • refers to mobile bearing knee design
   • LCS, RP
   • Orthopedics
   • https://doi.org…453670710013942