Final answer:
Grey Turner sign is characterized by flank bruising and indicates retroperitoneal hemorrhage. It is an important clue for healthcare providers to suspect serious conditions.
Step-by-step explanation:
Grey Turner sign is a medical sign characterized by flank bruising, which indicates retroperitoneal hemorrhage. This sign is named after George Grey Turner, a British surgeon who first described it. The presence of Grey Turner sign can be an important clue for healthcare providers to suspect serious conditions such as pancreatitis or abdominal aortic aneurysm.