The ringed cross is a class of Christian cross symbols featuring a ring or nimbus. The concept exists in many variants and dates to early in the history of Christianity. One variant, the cruciform halo, is a special type of halo placed behind the head of Jesus in Christian art. Other common variants include the Celtic cross, used in the stone high crosses of Ireland and Britain; some forms of the Coptic cross; and ringed crosses from western France and Galicia.