A calvarian hook, also known as a craniotomy hook, is a medical instrument used in neurosurgery. However, there are synonymous terms for this tool that describe its purpose and function in surgical procedures. One such synonym is a craniotome, which refers to a surgical instrument used to cut open the skull. Another term that can be used interchangeably is skull hook, which highlights its function of securing and stabilizing the skull during surgery. Additionally, it can also be referred to as a cranial retractor, as it is employed to retract and hold back soft tissues to allow adequate exposure of the surgical site. In summary, calvarian hook has synonymous terms such as craniotome, skull hook, and cranial retractor, each emphasizing a unique aspect of its role in neurosurgery.