LGBT is an initialism that stands for "lesbian, gay, bisexual, and transgender." In use since the 1990s, the initialism, as well as some of its common variants, functions as an umbrella term for certain sexualities and gender identities. The LGBT term is an adaptation of the initialism LGB, which began to replace the term gay (or gay and lesbian) in reference to the broader LGBT community beginning in the mid-to-late 1980s. When not inclusive of transgender people, the shorter term LGB is still used instead of LGBT.. — Wikipedia
