Nut

In stringed instruments, the nut is the ridge between the pegbox and the fingerboard of the instrument. The British term "nut" may also be used for the frog of the bow in a bowed string instrument. Also [Brit.] nut; [Amer.] frog; [Fr.] talon or hausse; [Ger.] Frosch; [It.] tallone; and [Sp.] tal'n.The lower part of the violin bow. Small piece near the peg box of a guitar which hold the strings away from the end of the fingerboard before inserting into the pegs