The term "PoolSchlesinger sign" refers to a medical phenomenon commonly known as the "Mammalian Diving Reflex". This reflex is an involuntary response observed in mammals, including humans, when the face is submerged in cold water. It involves several physiological changes that aim to conserve oxygen and facilitate survival in an aquatic environment. Alternative synonyms for the PoolSchlesinger sign include the "diving response" or the "diving reflex". These terms indicate the same physiological phenomenon, whereby the body activates a set of adaptations when encountering water immersion. The term PoolSchlesinger sign pays tribute to the researchers who extensively studied this reflex, highlighting their contributions to the field.