Vitamin K is a fat-soluble vitamin that plays a crucial role in blood clotting and bone metabolism. However, it is sometimes referred to by different names or synonyms, such as "phylloquinone," which is its scientific name, and "menaquinone," which refers to a group of related compounds that also have vitamin K activity. Another synonym for vitamin K is "antihemorrhagic factor," which reflects its importance in preventing excessive bleeding. In addition, some sources may refer to vitamin K as "coagulation vitamin" or "clotting vitamin" due to its role in the blood clotting process. Despite the various names, vitamin K remains an essential nutrient for maintaining optimal health.