Baritone clef
An F clef placed on the third line of the staff.
What it means
The baritone clef is a variant of the F clef in which the line marking the pitch f is the third line from the bottom, rather than the fourth line as in the common bass clef. This places the range covered by the clef a third higher overall than the bass clef.
In the notation
Like every F clef, the sign consists of a notehead with two dots enclosing the line representing f; in the baritone clef, this notehead sits on the third line.
Musical use
The baritone clef was chiefly used in older vocal music for the baritone voice, whose range lies between bass and tenor and for which neither the bass nor the tenor clef fits especially well. In current practice it has largely fallen out of use; baritone parts are now usually notated in the ordinary bass clef.
The baritone clef should be distinguished from the baritone C clef, which notates the same range using a C-clef symbol on the fifth line: both serve the same practical purpose but differ in the clef symbol used.