Quivers are items in Minecraft Sol Edition. They're made so you don't have to carry bows and arrows.
When you open your inventory, you should see a tab that says "Quiver" in the top. You can move arrows and bows to this tab. At the top of it, there are two spots separated from the others: Which bow you want to use, and what you want to fire. Use Q to fire that arrow from that bow.
Wheat Quiver (lowest storage, 1 row of 5)Edit
Stick Quiver (second lowest storange, 1 row of 10)Edit