the chemical symbol for erbium, a rare earth element. It has atomic number 68 and an atomic weight of 167.26.
a trivalent metallic element of the rare earth group; occurs with yttrium
a room in a hospital or clinic staffed and equipped to provide emergency care to persons requiring immediate medical treatment
Er (Ð , Ñ€) is the eighteenth letter of the Cyrillic alphabet. It was developed from the Greek letter Rho. Er looks exactly the same as the upper case Rho.
This article contains a summary of the first season of the American fictional drama television series ER.