A G string is a type of underwear worn by women that is characterized by a thin string that goes between the buttocks. This type of underwear is also known as a thong, which is a popular synonym for the term. Other synonyms for G string include T-back, V-string, and string bikini. All of these terms refer to a similar style of underwear that is designed to provide minimal coverage while maintaining an attractive appearance. While the term G string is often associated with lingerie, it is also used to describe a type of guitar string that is particularly thin and used in flamenco and other types of acoustic guitar music.