The most commonly known Sapphic flag
Another, but not as commonly used, Sapphic flag.
Sapphic is an umbrella term for a woman or non-binary person (who identifies as a sapphic) that is attracted to other women and non binarys. Sapphic is not an exclusive identity; queer sapphics, lesbian sapphics and bisexual sapphics etc. are all equally sapphic, regardless of attraction to other genders.
The term sapphic is based on the Greek poet Sappho, who is known for her works featuring love between women.