Intersex is a term for those born with physical sex characteristics that cannot be traditionally classified as wolffian (male) or müllerian (female). Variations may appear in a individual’s chromosomes, hormones, genitalia, gonads, secondary sex characteristics, or some combination of these things.
Intersex does not describe a specific body type but rather is an umbrella term for a broad range of variations/traits. Some intersex individuals may closely resemble one of the binary sexes, while others are closer to in between. An intersex individual may have characteristics of both the wolffian and müllerian sexes, characteristics that fall somewhere in-between wolffian and müllerian, and/or characteristics that don't fall into either.
Intersex is included in the LGBT+ community, though not all intersex individuals consider themself to be LGBT+ on the basis on being intersex. This is largely a personal choice based on how one's status as intersex has (or hasn't) affected their experiences.
 
In 2013 Morgan Carpenter of Intersex Human Rights Australia designed the intersex flag.
In 2017 under the leadership of American civil rights activist Amber Hikes, Philadelphia’s Office of LGBT Affairs developed the rainbow flag to incorporate black and brown stripes to include black, brown, and people of colour.
Building on that in 2018 Daniel Quasar redesigned the flag to include trans people, creating the Pride Progress flag.
In 2021, Valentino Vecchietti of Intersex Equality Rights UK adapted the Pride Progress flag design to incorporate the intersex flag, creating this Intersex-Inclusive Pride Flag in 2021. 
 
https://www.consortium.lgbt/intersex-inclusive-flag/
 
£1 from every sale of this design is donated to Stonewall in support of their vital work with LGBTQ+ people and communities.
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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.