Book

The paper in books usually comes from trees. Not only that, the word ‘book’ also comes from trees.
 
The word book has its origins in the Proto-Indo-European (PIE) root bhago (beech tree), the source of Latin fagus which is the scientific name for the botanical genus of beech trees.
 
From PIE bhago evolved Proto-Germanic bokiz (beech) and modern German buche (beech) and buchstaben (a beech stick). Beech wood, because of its softness and ease of cutting, was most often used as a medium for the use of runes (i.e., any of several alphabets used by Germanic peoples from about the 3rd to the 13th centuries) which were carved into the wood. Perhaps it is not surprising that German Buch (book) comes from buche (beech tree).
 
The Old English word boc (book), from Proto-Germanic bokiz, originally meant any written document. Later, the word book came to mean a written work of many pages fastened together and bound.
 
From bokiz to Buch to boc to book—a book literally and figuratively comes from trees.
 
Similarly, the French word for book (livre) comes from Latin librum (the inner bark of trees) and from PIE lubh-ro (leaf, rind). The word library also comes from these sources.
 
Perhaps it is not surprising to consider the image of the tree has been used as a symbol of knowledge over the years. However, this image might have to change if more and more people begin to get their knowledge from YouTube and Wikipedia!
 
Online Etymological Dictionary, https://www.etymonline.com/
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