1.325 tuning fork ================= ES: diapasón [de horquilla], I: diapason, corista, F: diapason, D: Stimmgabel, NL: stemvork, DK: stemmegaffel, S: stämgaffel, FI: viritysavain, äänirauta. A two-pronged piece of steel used to indicate an absolute pitch, usually for _A_ above middle C (440 cps/Hz), which is the international tuning standard. Tuning forks for other pitches are available. See also ........ middle C.