There are multiple definitions:

1. intensive care unit(English)

   • ICU-AW, ITU, MICU, NICU, PICU, SCU, SDD, SOD, VRE, BICU, UCC, eICU, CTICU, ANC, BPCR, C/S, MDSR, MMR, SDG, WHO, PM
   • Intensive care medicine, Terminal / palliative care
   • https://doi.org…55/2023/7767208

2. interferometric color unit(English)

   • LLT derived from the image is calculated, where 1 ICU reflects approximately 1 nm. The maximum LLT value is limited to 100 nm
   • LLT
   • Ophthalmology
   • https://doi.org…fma.2020.10.028