Coda (in music) is a term that shows us that a particular passage or piece has to be taken from the end.
In music you can often see a sign named "Dal Segno al Coda" or just "D.S. al Coda" (meaning "From the sign to the end") .That means you will have to repeat the sequence between that sign and the "coda".
(You have bellow a photo with these signs.)
Have a nice day :)
