Pentecost, celebrated on the Sunday 50 days after Easter (the name comes from the Greek pentekoste, "fiftieth"). is the festival when Christians celebrate the gift of the Holy Spirit. In England, it is also known as "Whitsunday" (white Sunday). In the Old Testament, it is referred to by several names:, The Feast of Weeks, The Feast of Harvest and The Day of First-Fruits. Two notable symbols of the Holy Spirit and his activity are the elements of wind and fire. On Pentecost Sunday, Christians around the world will celebrate this holy day, with symbols of flames, a dove and wind marked throughout churches. The main sign of Pentecost in the West is the colour red. It symbolizes joy and the fire of the Holy Spirit. Priests or ministers, and choirs wear red vestments, with people of the congregation wearing red clothing in celebration as well.