Accidentals go in front of the notes.

UGA Accidentals was created in 1974.

A natural sign cancels all applicable accidentals in that bar as well as accidentals in the key signature. However, in the case of the key signature accidentals, the natural sign is only applicable to that bar.

The answer is Accidentals.

Sometimes for melodic purposes, a composer will want to use a note that is not in the key signature. Accidentals are used to alert the performer that the note has been altered.