Why do the people of this crowd have palm branches in their hands?
Revelation 7:9 (ESV)
9After this I looked, and behold, a great multitude that no one could number, from every nation, from all tribes and peoples and languages, standing before the throne and before the Lamb, clothed in white robes, with palm branches in their hands,
In the Bible palm branches are symbols of triumphant joy (see John 12:13). This crowd rejoices in the presence of their victorious Lord and Saviour.
9 After this I looked, and behold, a great multitude that no one could number, from every nation, from all tribes and peoples and languages, standing before the throne and before the Lamb, clothed in white robes, with palm branches in their hands,