Glossary of Images and Related Explanations in the Revelation:

The Lamb Opening the Book (Scroll)
with Seven Seals

"...behold, the Lion that is from the tribe of Judah, the Root of David, has overcome so as to open the book and its seven seals." 6And I saw between the throne (with the four living creatures) and the elders a Lamb standing, as if slain, having seven horns and seven eyes, which are the seven Spirits of God, sent out into all the earth. 7And He came, and He took it (the book or scroll) out of the right hand of Him who sat on the throne."
Revelation 5:5-75 (NAS)