Final answer:
In music, the sharp symbol is represented by '#', which indicates that a note should be raised in pitch by a semitone.
Step-by-step explanation:
Musically speaking, sharp is represented by the symbol #. In written music, this symbol is placed in front of a note to indicate that the note should be played a semitone (half step) higher in pitch. For instance, if you see a C note with a sharp symbol, it's called C-sharp and is played slightly higher than a normal C note. The other symbols mentioned, such as the caret (^), plus (+), and equals (=), do not indicate a sharp note in music.