A symbol called a natural. It resets the note to it's normal "white note" name.
*Bar lines can also cancel sharps, naturals or flats. For example say you are in C major and for one measure you have an F sharp and you don't carry into the next measure with a tie, the bar line will automatically reset the F sharp into an F natural so sometimes a natural symbol is not needed*
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Offhand, I would say that is a misprint. However, a natural and flat means to return to a normal flat note after a double-flat. For example, suppose you are in a key with B-flat in the key signature, but you have an E-flat diminished chord, which includes B-double-flat. After that you have a regular B-flat. The natural cancels the double-flat, and the single flat returns to the usual note. After a double-sharp, a natural and sharp would do the same thing.
What cancels an acciental in a Natural sign in front of a note. Example G Major (F#, F sharp). Any note in the line or space of the note F will be affected, but if there is a natural sign it will be restored to its original pitch.
The enharmonic equivalent to A-flat is G-sharp; The enharmonic equivalent to G-flat is F-sharp.
G sharp
B-flat to C-sharp is an augmented 2nd.