The term "Poly Ig Receptor" refers to a protein found in the human body that plays a crucial role in the immune system. It is responsible for transporting antibodies, also known as immunoglobulins, across mucosal surfaces. However, several synonyms can be used interchangeably to denote this protein. One common synonym is "polymeric immunoglobulin receptor", which emphasizes its function as a transporter of immunoglobulins. Another synonym is "secretory component receptor", referring to its ability to bind to the secretory component of antibodies. Finally, "pIgR" is a frequently used abbreviation, offering a convenient way to refer to the protein in a shorter form. Overall, these synonyms allow for diverse terminology while referring to the same protein, enhancing communication within the scientific community.