ESU is a three-letter abbreviation that can have different meanings in various contexts. There are various synonyms for ESU, depending on the context of its usage. In healthcare, ESU stands for Electrosurgical Unit, which can be interchangeably referred to as electrocautery. Some possible synonyms for ESU in the field of medicine include surgical diathermy, electrosurgery, or cautery. In education, ESU can refer to Emporia State University, and its synonyms may include ESU Hornets or Emporia State. In transportation, ESU commonly stands for Electronic Control Unit, which can refer to the control module of an automobile's engine. Additional synonyms for ESU in the context of transportation can include car computer or engine control module.