Nail or Nails may refer to: In biology. Nail (anatomy), toughened protective protein-keratin (known as alpha-keratin, also found in hair) at the end of an animal digit, such as fingernail. Nail (beak), a plate of hard horny tissue at the tip of some bird beaks. Objects. Nail (fastener), the pin-shaped fastener used in engineering, woodworking and construction. Nail (relic), used in the crucifixion of Christ. The Exchange nails, bronze tables outside of The Exchange, Bristol. Arts and entertainment. JLA: The Nail series, a 1998 three-issue comic book miniseries.
https://en.wikipedia.org/wiki/Nail