There are multiple definitions:

1. locked nucleic acid(English)

   • RNA
   • Biochemistry

2. low noise amplifier(English)

   • ARFI, CEUS, FDBF, IQ, TGC, SWEI, ULM, opamp, CMRR
   • Bioengineering, Ultrasound, Signal analysis
   • https://doi.org…OC.2019.2932116
   • https://skills.…plifiers/691732