The lower case Greek letter lambda was chosen as a symbol by the Gay Activists Alliance of N.Y. after the group split from the Gay Liberation Front in 1970. The lambda could be mistaken as a college fraternity symbol, but was recognized by those in the know. The Gay Activists Alliance headquarters was destroyed by arson, along with its records, and the organization collapsed, but the lambda as a gay rights symbol lived on.
Gay Activists Alliance
The History Project: Documenting LGBTQ Boston
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“BOSTON/LAMBDA,” Documented | Digital Collections of The History Project, accessed January 24, 2019, https://historyproject.omeka.net/items/show/64.