哦

ò
oh (interjection indicating that one has just learned sth)

CEDICT

Homographs

哦 é to chant
哦 ó oh (interjection indicating doubt or surprise)
哦 o
  1. sentence-final particle that conveys informality, warmth, friendliness or intimacy
  2. may also indicate that one is stating a fact that the other person is not aware of