World Conjoined Twins Day is observed worldwide every November 24. Established by the United Nations General Assembly, the day aims to promote the well-being, social inclusion, and human rights of conjoined twins, who are a rare type of identical twins joined together in the womb, occurring in approximately 1 in 50,000 to 200,000 live births. The term "Siamese twins" originated from Chang and Eng Bunker, conjoined twins born in Siam (now Thailand) in 1811, who gained public attention through their travels and performances. Conjoined twins can face unique challenges and may have varying survival rates depending on the type of conjunction and shared organs; for example, omphalopagus twins have a survival rate of over 80%. The day serves to highlight their individuality and quality of life, encouraging understanding and support for their distinct experiences.