Scroll

סֵפֶר Strong’s #5612 sepher

This is the book of the generations of Adam. In the day that God created man, in the likeness of God made he him.

Genesis 5:1

https://biblehub.com/hebrew/5612.htm

Books are a fairly recent invention. In ancient times texts were written down on square sheets of skin or papyrus (made from reeds and the origin of our word paper). Multiple sheets would then be sown together creating one long sheet called a scroll. This long sheet was then rolled up and placed in a leather sleeve or clay jar for storage. In caves near the Dead Sea in Israel hundreds of these scrolls were discovered, which included texts of the Tenakh (Old Testament) as well as non-Biblical texts.