Post from transidalliance around August 2022:

anon: “Is there a flag for transintersex? if not, can you coin it? I’m an amab transintersex transmasc -🎪”

“If we remember correctly and are not mistaken we are pretty sure this is the transintersex flag! Hope this helps you anon we hope you have a good day and remember you are valid!!!/gen”

Flag:

Archive of Post: https://archive.md/8Ylhq#selection-13183.0-13183.24

Context: It is unclear who originally coined this.