Final answer:
The Annunciation refers to the angel Gabriel announcing to Mary that she will conceive a child by the Holy Spirit, and she is instructed to name the child Jesus.
Step-by-step explanation:
The event you are referring to is known as The Annunciation, a key moment in Christian theology where the angel Gabriel announces to Mary that she will conceive a child by the Holy Spirit. According to the biblical narrative, specifically in Luke 1:26-38, Mary is to name the child Jesus.
This moment has been a significant subject in Christian art, depicted in various mediums throughout history, symbolizing the incarnation of Christ. The interaction between Gabriel and Mary is one of the most celebrated events leading up to the birth of Jesus.