There are several synonyms for the term "jacket for violently insane people." One of them is "straitjacket," which is a garment designed to restrain the arms and upper body of a person with mental illness. Another synonym is "restraint jacket," which refers to a jacket used to limit the movement of a person with aggressive tendencies. Additionally, the term "psychiatric jacket" or "mental health jacket" may be used to describe a specialized garment used to manage the behavior of individuals with severe mental health disorders. These jackets are commonly used in psychiatric hospitals and other mental health facilities.