Butch is an identity used in LGBT+ subculture to describe someone, typically a lesbian or otherwise sapphic woman, who has a masculine gender presentation. The term "butch" tends to denote a degree of masculinity beyond what would be considered typical of a tomboy.
Butch women often dress in masculine clothing, and typically present themselves in a more stereotypically masculine way, such as having short hair, not wearing makeup, and not shaving. Butches are also commonly thought of as having more "masculine" interests, such as sports, mechanics, and other hands-on jobs. Some butches will take on masculine names or nicknames, and some may use masculine pronouns. Some butches bind their chest or take masculinizing hormones to appear more masculine. 
Traditionally, butches have been expected to be attracted to femmes. For some butches, this attraction to femmes represents a strong part of their own identity. However, some butches are attracted to other butches. This phenomenon is commonly referred to as "masc-for-masc" or "butch-for-butch."
 
The Butch Lesbian Pride Flag was created in the style of the Rainbow Pride Flag and the Lesbian Pride Flag, but with darker, more "masculine" colours as an alternative to the lighter feminine colours of the original. Although the flag designer Dorian Rutherford never explicitly explained the meaning of the coloured stripes, people assume blue represents masculinity and purple represents lesbian and woman-identified individuals. White represents people across the gender and sexuality spectrums more broadly. 
 
https://pride-flags.deviantart.com/art/Butch-Lesbian-630382202
 
 
Disclaimer: Terms and labels within the community are largely adopted through self-identification, and their definition may not be agreed upon by all who identify with them. Descriptions provided here are an informal overview and are for informational purposes only. We cannot be held responsible for the contents or accuracy of any pages referenced by external links.