Human Platelet Antigens (HPAs) are critical in determining the compatibility of platelet transfusions between individuals. These antigens essentially act as markers on the surface of platelets, enabling the immune system to identify them as either 'self' or 'foreign'. Synonyms for HPA can vary depending on the context and field of study. In certain scientific literature, HPAs may be referred to as Platelet Alloantigens or Platelet Antigens. Additionally, terms like Platelet-Specific Antigens or Platelet Glycoprotein Antigens can also be used interchangeably. These synonyms are essential to enhance communication and ensure a clear understanding of the subject matter when discussing and researching human platelet antigens.