RYDEX SERS FDS INVERSE HIGH YIELD MUTUAL FUNDS USMF - What does RYDEX SERS FDS INVERSE HIGH YIELD MUTUAL FUNDS USMF mean? - What does RYDEX SERS FDS INVERSE HIGH YIELD MUTUAL FUNDS USMF stand for? - RYDEX SERS FDS INVERSE HIGH YIELD MUTUAL FUNDS USMF meaning