A king is a head of state, who may or may not, depending on the style of government of a nation, exercise monarchal powers over a territory, usually called a kingdom or a realm. A king is the second highest noble title, surpassed only by emperor. The female equivalent of King is Queen; although the term "queen" may refer to one ruling as a monarch in her own right, a queen regnant, or to the wife of a king, a queen consort. The husband of a queen regnant is sometimes styled the king consort but is more commonly styled the prince consort. A king or queen may wear a crown or carry other regalia (symbols of office).