And yes, "no-forn"
Information could be Secret and NOFORN or Secret and Five-Eyes, for instance.
The classification scheme is broadly cut up into Confidential, Secret, Top Secret, and Codeword. There are many modifiers to that such as Five-Eyes, Cosmic (NATO), and Restricted-Data (Nuclear Weapon Design).
There are a menagerie of controls that don't rise to classification, like NOFORN, Law Enforcement Sensitive, For official use only, etc.
Below Confidential exist other “unclassified” states, like “For Official Use Only” and “No Foreign” (a.k.a., NOFORN). Then, regardless of the classification, you should also have to prove “Need to Know”.
To me, the most interesting aspects of classification were that the title, content, and classification level itself don't necessarily share levels.
As others have pointed out, Confidential is classified, the lowest classification level.