A speculum is a medical tool for investigating body orifices, with a form dependent on the orifice for which it is designed. In old texts, the speculum may also be referred to as a diopter or dioptra.
Sims' vaginal speculum
…Sims' vaginal speculum is a double-bladed speculum used in gynaecology for examining the vagina and cervix. It was developed by J. Marion Sims. Sims' speculum is inserted into the vagina to retract…