Double Venus
The lesbian union sign.
In Nazi Germany, the downward pointing black triangle indicated persons who were asocial which included lesbians. The symbol was reclaimed by lesbians after WWII.
Front cover of Lesbian Herstory Archives Newsletter #18, 2001.
The Sapphic Violet
Violets have been associated with lesbians for centuries. and gained in popularity in the 1920s.
It's a old joke that a lesbian will receive a toaster for converting a straight woman.