The Eo is a river, long, in northwestern Spain. Its estuary forms the boundary between the regions of Galicia and Asturias. The river is known for its salmon fishing.
ㅓ is one of the Korean hangul. The Unicode for ㅓ is U+3153.
Eo (hangul: 어; hanja: 敔) is a wooden percussion instrument carved in the shape of a tiger with a serrated back, played by running a bamboo whisk across it to mark the ends of sections. Its name is derived from the Chinese yǔ.