LGBT is an initialism that collectively refers to the lesbian, gay, bisexual, and transgender community. In use since the 1990s, the term LGBT is an adaptation of the initialism "LGB", which itself started replacing the phrase gay community beginning in the mid-to-late 1980s, which many within the community in question felt did not accurately represent all those to whom it referred. The initialism has become mainstream as a self-designation and has been adopted by the majority of sexuality and gender identity-based community centers and media in the United States and some other English-speaking countries.
The term LGBT is intended to emphasize a diversity of sexuality and gender identity-based cultures and is sometimes used to refer to anyone who is non-heterosexual or non-cisgender instead of exclusively to people who are lesbian, gay, bisexual, or transgender. To recognize this inclusion, a popular variant adds the letter Q for those who identify as queer and/or are questioning their sexual identity as "LGBTQ", recorded since 1996.
On the one hand, some intersex people who want to be included in LGBT groups suggest an extended initialism "LGBTI" (recorded since 1999). This initialism "LGBTI" is used in all parts of "The Activist's Guide" of the Yogyakarta Principles in Action. Furthermore, the initialism "LGBTIH" has seen use in India to encompass the hijra third gender identity and the related subculture.