ô means “oh” | MotiTan French Dictionary

More examples

Ô, je n'en reviens pas.

Oh, I can't believe it.

A raised voice reaching outward to summon attention or heighten emotion.

oh: A common brief exclamation expressing surprise or admiration.
ah: A brief exclamation expressing surprise or sudden realization.

Ô interjection ancienne ou stylistique servant à appeler, s'exclamer ou intensifier un sentiment dans un registre soutenu.

The interjection descends from Latin ō through Old French o, with ô preserved as its traditional literary spelling.

In modern French, ô is mainly literary, ceremonial, or poetic, while everyday surprise usually uses oh or another interjection.