"Bh" typically refers to the chemical symbol for the element Bohrium, which is a synthetic element with the atomic number 107. It was first synthesized in 1976 and is named after the physicist Niels Bohr. Bohrium is part of the transition metals group and is highly radioactive, with no stable isotopes. Due to its short half-life, Bohrium does not have significant practical applications and is primarily used for research purposes in nuclear physics. Its properties are not well-studied, as only a few atoms have ever been produced, making it one of the least understood elements in the periodic table.