Lwaxana's fork
Seven of Nine using one of Voyager's three tine forks
A fork is an eating utensil often made of metal. It is comprised of a handle and at least three sharpened ends on which food can be spiked. The metal tines vary in width and length, and have been sharp enough to pierce human skin.
The utensil is used to lift food to the mouth or to hold ingredients in place while they are being cut. Food can be lifted either by spearing it on the tines, or by holding it on top of the tines.
The use of the fork was common on Earth, although other cultures have been known to use them.
Riker using a hybrid utensil with four tines
Lwaxana Troi and Jean-Luc Picard used decorated forks during their dinner aboard the USS Enterprise-D in 2365. (TNG: "Manhunt")
In 2366, Guinan stabbed Q's right hand with a fork, as evidence that he was indeed Human. (TNG: "Deja Q")
The social skills Data taught Lal in 2366 included eating food with a fork. (TNG: "The Offspring")
In 2374, Benjamin Sisko improvised a broken tine from a metal fork in the survival kit into a tool to work the communication system circuitry. (DS9: "Waltz")