The lower part of the violin bow. This is where the performer holds the bow, and where the device is placed (the "nut") to adjust the tension of the hair.
See also [Brit.] nut; [Eng.] frog; [Eng.] heel; [Fr.] talon (m); [Fr.] hausse (f); [Ger.] Frosch (m); [It.] tallone (m). [Sp.] talón (m).