This is an Orthodox icon depicting Jesus Christ, specifically a representation of Christ Pantocrator.

Christ Pantocrator means "Ruler of All" in Greek and is a central icon in the Orthodox Church, portraying Christ as both the Righteous Judge and the Lover of Mankind.

The icon features Christ holding the New Testament in his left hand and making a gesture of blessing or teaching with his right hand.

His halo is cruciform and inscribed with the Greek letters Ο Ω Ν (ho ōn), meaning "He Who Is," referring to God's self-revelation to Moses.

The letters "IC XC" often appear on either side of Christ's halo, which are an abbreviation for "Jesus Christ" in Greek (Ἰησοῦς Χριστός).