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Encyclopedic overview
Esca can refer to: Esca (fish anatomy) or illicium, a modified luminescent fin ray found in anglerfish and frogfish Esca (grape disease) the Ezka, a river in the Basque country known as "Esca" in Spanish ESCA or Electron Spectroscopy for Chemical Analysis, now known as X-ray photoelectron spectroscopy (XPS)
Excerpted from Wikipedia’s “Esca” article, available under the CC BY-SA 4.0 licence.