It pertains to the features of the cervix and the uterine isthmus.
Hegar's sign is more difficult to recognize in multiparous women.
Interpretation: On bimanual examination (two fingers in the anterior fornix and two fingers below the uterus per abdomen), the abdominal and vaginal fingers seem to oppose below the body of uterus (examination must be gentle to avoid abortion).
[3] This sign was repeatedly demonstrated and described by Ernst Ludwig Alfred Hegar, a German gynecologist, in 1895.
Hegar credited Reinl, one of his assistants, who originally described this sign in 1884.