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I find it:

'Corni' is 'Horns' in Italian

A reed instrument, related to the oboe, but deeper in pitch;
the English horn

what is Corni in F?

I am working on Mozart Symphony No.6 in F Major, K.43 Andante, it is for Flauti, Corni in F, Violin I, Violin II, Viola I, Viola II, Basso.
But I do not know what is the Corni in F.

Anyone can help me? thanks!