The adjective form is viceregal, less often viceroyal. The royal and viceroyal figures may unilaterally use these powers in exceptional constitutional crisis situations. Others symbolise royal and viceroyal figures or royal honours bestowed on a unit or regiment. In Yorubaland, a viceroyal chief is known as a Baale. In the Sokoto Caliphate, a viceroyal chief is known as a Hakimi.