Final answer:
Estradiol (Estrace, Climara) is a type of estrogen commonly used in hormone replacement therapy (HRT) for menopausal symptoms.
Step-by-step explanation:
The type of estrogen commonly used in hormone replacement therapy (HRT) for menopausal symptoms is Estradiol (Estrace, Climara). It is a synthetic form of estrogen that is similar to the estrogen produced by the ovaries. Other types of estrogens used in HRT include Conjugated estrogens (Premarin), Esterified estrogen (Menest), and Estropipate (Ogen).