Triple X Syndrome

Triple X Syndrome or 47,XXX or trisomy X is an intersex trait affecting 1/1000 AFAB individuals, causing them to have an extra X chromosome (XXX) in each of their cells.

Resources

 * 1) https://ghr.nlm.nih.gov/condition/triple-x-syndrome
 * 2) https://www.deviantart.com/pride-flags/art/Triple-X-Syndrome-658903411