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In music theory, the key identifies the tonic triad, the chord, major or minor, which represents the final point of rest for a piece, or the focal point of a section. Although the key of a piece may be named in the title (e.g. Symphony in C), or inferred from the key signature, the establishment of key is brought about via functional harmony, a sequence of chords leading to one or more cadences. A key may be major or minor; music in the Dorian, Phrygian, and so on are usually considered to be in a mode rather than a key. When a particular key is not being described in the English language, different key naming systems may be used.