There are multiple definitions:

1. serum amyloid A [protein](English)

   • SAP, SAA-1
   • Clinical chemistry

2. small aortic annulus(English)

   • refers to transcatheter aortic valve implantation
   • PPM, TAVI
   • Cardiology, Surgery
   • https://doi.org…admedsg.2022167

3. severe aplastic anemia(English)

   • AA, NSAA, VSAA
   • Erythrocyte, Hematology
   • https://www.ncb…les/PMC8948483/