noun
shelf
SHELF/ʃelf/
A flat projecting support on which things rest.
The wooden shelf supports three books and a small bowl.

Etymology
The word already meant a horizontal supporting plank in its earliest recorded use. It may come from a Middle Low German word for shelving or an Old English word whose precise meaning is uncertain.
In context
it was a small shelf my friend find on the street and I took it from her when she moved I added a 10 Ikea shelf board on top
More examples
- Keep the flour on the lowest pantry shelf.
- The refrigerator shelves slide out for easy cleaning.
- We raise the shelf to make room for taller bottles.