Two notes are enharmonic equivalent in 12-TET if they share the same pitch or pitch class, but have different note names.
Here are all of the twelve pitch classes listed with their enharmonic-equivalent names:
- C (or B♭♭)
- D (or C or E♭♭)
- E (or D or F♭)
- F (or E♭♭)
- G (or F or A♭♭)
- A (or G or B♭♭)
- (or t for ten). A or B♭
- (or e for eleven). B (or A or C♭)
Chords, scales, or keys can also be enharmonic-equivalent if their notes are enharmonic, for example the Key of F# Major and the Key of G♭ Major.
See Staff Notation for more on why a single pitch class has multiple names.