Tritone

A tritone is an interval close to 600 cents, or the size of three whole tones (hence the name). The interval of exactly 600 cents is the semioctave, perfect median, or perfect tritone, and is the unique interval whose octave complement is itself

Properties of tritones in general

A tritone produces a neutral trine when played with the octave. Tritones tend to not be easily found in odd-numbered forms, but are structurally important in even-numbered forms. As an interval category, the octave-complement of a tritone is itself another tritone,