There are multiple definitions:

1. estimated time of arrival(English)

2. endothelin-A(English)

   • G-protein coupled receptor used by ET-1 to regulate vascular tone by vasoconstriction. In general its receptor functions to promote vasoconstriction and inflammation
   • ET-1, ETB
   • Receptors, Vessel properties
   • https://doi.org…NAHA.122.063327

3. extradural temporopolar approach(English)

   • ICA, RSD
   • Vascular disease, Surgery, Brain (dys)function
   • https://doi.org…neu.2016.02.120