LGBT, or GLBT, is an initialism that stands for lesbian, gay, bisexual, and transgender. In use since the 1990s, the term is an adaptation of the initialism LGB, which was used to replace the term gay in reference to the LGBT community beginning in the mid-to-late 1980s. Activists believed that the term gay community did not accurately represent all those to whom it referred.
The initialism, LGBT, is intended to emphasize a diversity of sexuality and gender identity-based cultures. To recognize this inclusion, a popular variant adds the letter Q for those who identify as queer or are questioning their sexual identity; LGBTQ has been recorded since 1996.
The gender identity “transgender” has been recategorized to trans* by some groups, where trans (without the asterisk) has been used to describe trans men and trans women, while trans* covers all non-cisgender (genderqueer) identities.
When not inclusive of transgender people, LGBT is sometimes shortened to LGB.