Erythroferrone is a hormone produced by erythrocytes or red blood cells in response to low oxygen levels or hypoxia. This hormone stimulates iron uptake and erythropoiesis or the production of new red blood cells. While erythroferrone is a unique term, there are synonyms that refer to the same hormone or its function. For instance, erythroid regulator hormone, hypoxia-inducible factor, and erythropoietin regulator are alternative expressions for erythroferrone. Other related terms include iron-regulating hormone and hypoxia-responsive hormone, among others. Understanding these synonyms can help in comprehending the complex interplay between red blood cells, iron metabolism, and oxygen delivery in the body.