staple

material suitable for manufacture or use or finishing

a natural fiber (raw cotton, wool, hemp, flax) that can be twisted to form yarn

“staple fibers vary widely in length”

a necessary commodity for which demand is constant

a short U-shaped wire nail for securing cables

necessary or important, especially regarding food or commodities

“wheat is a staple crop”

paper fastener consisting of a short length of U-shaped wire that can fasten papers together

secure or fasten with a staple or staples

“staple the papers together”