Orthodox, Byzantine style Icon. Pentecost, descent of the Holy Spirit. Mounted Icon print. The Icon for the feast of Pentecost is also called the Descent of the Holy Spirit, as it is a depiction of the event described in the Book of Acts, when the Holy Spirit descended as tongues of fire upon the Apostles gathered together and enabled them to preach in different languages. Available in 2 sizes, please select size from options menu below.