There are multiple definitions:

1. analytical transmission electron microscopy(English)

   • CBED, HRTEM, TEM
   • Microscopy

2. ambulatory event monitor(English)

   • different monitoring strategies may produce different results with respect to diagnosis and care
   • ACM, AF, CEM, ECG, LTCM, MCT
   • Monitoring, Cardiology, Electrophysiology
   • https://doi.org…ahj.2023.12.002