D♭ major has 5 flats — B♭, E♭, A♭, D♭, G♭. Here's the signature on the staff, the full scale, its relative minor, and the trick to recognize it instantly.
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In any flat key the second-to-last flat names the key. D♭ major's flats are B♭, E♭, A♭, D♭, G♭, so the second-to-last, D♭, is the tonic — D♭ major.
The D♭ major scale runs D♭, E♭, F, G♭, A♭, B♭, C. Every flattened note in the piece takes the key's accidentals automatically, which is exactly what the signature saves you from writing note by note.
D♭ major shares its signature — 5 flats — with its relative minor, B♭ minor, a minor third below the tonic. They use the same seven pitches; what tells them apart is which note the music settles on and treats as home.
D♭ major has 5 flats — B♭, E♭, A♭, D♭, G♭.
The relative minor of D♭ major is B♭ minor — it shares the identical key signature (5 flats).
The D♭ major scale is D♭, E♭, F, G♭, A♭, B♭, C.
Keep practicing: key signature quiz · circle of fifths · key trainer
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