The bass clef is a clef that is used for instruments that produce predominantly low pitches, such as the bassoon, trombone and cello as well as on the lower of the two staves for piano sheet music. It resembles a large, reversed letter C with two dots vertically aligned to its immediate right, and it is placed so that the two dots are just above and below the F line, which is the second from the top line on any stave on which it is used.