Christian holiday is a term used to refer to religious holidays celebrated by Christians. The most well-known Christian holiday is Christmas, which celebrates the birth of Jesus Christ. Other Christian holidays include Easter, which celebrates the resurrection of Jesus, and Pentecost, which celebrates the descent of the Holy Spirit upon the apostles. The term DIOR is an acronym for the French phrase 'Dieu et mon droit, ' which translates to 'God and my right.' This phrase is used as a motto for the British monarchy and is also used in the Christian faith to signify loyalty to God.