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Reference.org
Enharmonic equivalence
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<p>In music, two written notes have enharmonic equivalence if they produce the same <a href="/facts/Pitch_(music)/fQAK0JsC">pitch</a> but are <a href="/facts/Musical_notation/eubaB0AK">notated</a> differently. Similarly, written <a href="/facts/Interval_(music)/aFwkkgpY">intervals</a>, <a href="/facts/Chord_(music)/hJBCHCSB">chords</a>, or <a href="/facts/Key_signature/Pz4Gkn9N">key signatures</a> are considered enharmonic if they represent identical pitches that are notated differently. The term derives from Latin <i>enharmonicus</i>, in turn from <a href="/facts/Late_Latin/Ju8RH1es">Late Latin</a> <i>enarmonius</i>, from Ancient Greek ἐναρμόνιος (<i>enarmónios</i>), from ἐν ('in') and ἁρμονία ('harmony'). </p>