Br is the chemical symbol for the element bromine, which is a reddish-brown liquid at room temperature. It belongs to the group of elements known as halogens, which also includes fluorine, chlorine, iodine, and astatine. Bromine is known for its strong odor and is used in various applications, including flame retardants and certain types of pharmaceuticals. Bromine is found naturally in seawater and in mineral deposits. It is highly reactive and can form compounds with many other elements. Due to its reactivity, bromine must be handled with care, as it can be harmful to human health and the environment.