Sapphic

One of the many proposed sapphic flags over the years

Preface: you could easily write entire books about this identity, so this will just be a brief overview

The term "sapphic" at its most basic definition means "woman who loves women". Many people prefer the term "sapphic" over "lesbian" because they feel the term "sapphic" is more friendly to nonbinary individuals.

The term "sapphic" is believed to have come from the Greek word "Sapphos" which is a reference to a woman who was a poet. 

Many pride flags have popped up over the years. The "lipstick lesbian" flag is a popular one but people have discovered that the person was a trans-exclusionary radical feminist, which made many people uncomfortable. There is no one predominant flag for the sapphic community. Whenever any kind of PRIDE event sells or features sapphic based merchandise, there is normally a large variation of "sapphic" based flags, and this is the reason why.

Some people will use phrases like "sapphic asexual". To these individuals, this normally means something along the lines of "I am asexual but I find myself attracted, on some level, solely to other women or have a very strong preference for women over other identities". 

A famous sapphic group in history is the "Samois" group. There were a lesbian-feminist BDSM organization based in San Francisco, California, USA, that existed from 1978 to 1983.