The fairbairn-sykes fighting knife is a special kind of knife that was used by soldiers during wars. It was designed by two people named Fairbairn and Sykes who wanted to make a knife that was really good for fighting.
The knife looks different from other knives you might have seen because it has a very sharp, triangular-shaped blade that ends in a point. This point is called a "tip" and is very important for stabbing because it can go deep into an enemy's body.
The handle of the knife is also special because it's very thin and is made of hard materials. This helps the soldier hold the knife tightly and makes it easier to control when fighting.
The fairbairn-sykes fighting knife was used in many wars, especially during World War II. Soldiers were trained to use it in close combat situations, where they had to fight with enemies up close. It was a very deadly weapon and helped soldiers win battles.
Nowadays, the fairbairn-sykes fighting knife is still used by some people, but mostly for special purposes like hunting or self-defense. It's not something that you would normally see people carrying around because it's dangerous and not something to play with.