The B flat minor augmented chord is a 3-note chord consisting of the notes Bb, Db and F#.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Bbm#5.
Interactive piano diagram for the B flat minor augmented chord
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows
the notes for the the Bbm#5 chord. Feel free to save or share the image as needed.