Today we celebrate the Christian holy day known as Pentecost, the 50th day (seventh Sunday) following Easter Sunday. On this day, the Holy Spirit descended upon the Apostles and other followers of Jesus, while they were celebrating the Feast of Weeks in Jerusalem. The symbols used to represent the Holy Spirit (also symbols of Pentecost), include flames, wind, God's breath, and a dove. This day marks the end of the Easter season.
Acts 2: 1-4
1 And when the day of Pentecost was fully come, they were all with one accord in one place. 2 And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting. 3 And there appeared unto them cloven tongues like as of fire, and it sat upon each of them. 4 And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.