There are multiple definitions:

1. ventricular asynchronous, no sensing, no response to sensing pacemaker(English)

   • ESWL, AOO, DOO
   • Electrophysiology, Nomenclature, Cardiology

2. virgin olive oil(English)

   • EVOO, AEES, HDL, LCAT, LDL, FVOO, FVOOT, OO, OOPC, PC, PON
   • Nutrition, Microbiome, Metabolism
   • https://doi.org…/mnfr.201500030
   • https://doi.org…lecules28031249